dblatex Randomly Produces Bold Pages

I'm using dblatex via Python to produce a PDF file on a
Windows machine.  Here is my command line.

 

C:\xml> python C:\Python26\scripts\dblatex -P
latex.hyperparam=colorlinks,linkcolor=blue my_file.xml

 

For some reason, on two of the pages, all text is bold,
including the header and footer.

 

The XML has been validated using Jing against the RelaxNG
schema.

 

Here are samples of the XML used to produce each of the
pages.  Each is in an appropriate context.  Ellipses represent plain text.

 

Sample 1:

 

                                                <procedure>

                                                                <step
performance="required">

                                                                                <para>

                                                                                                ...

                                                                                </para>

                                                                </step>

                                                                <step
performance="required">

                                                                                <para>

                                                                                                ...

                                                                                </para>

                                                                                <variablelist>

                                                                                                <varlistentry>

                                                                                                                <term>

                                                                                                                                ...

                                                                                                                </term>

                                                                                                                <listitem>

                                                                                                                                <para>...</para>

                                                                                                                </listitem>

                                                                                                </varlistentry>

                                                                                                <varlistentry>

                                                                                                                <term>

                                                                                                                                ...

                                                                                                                </term>

                                                                                                                <listitem>

                                                                                                                                <para>...</para>

                                                                                                                </listitem>

                                                                                                </varlistentry>

                                                                                                <varlistentry>

                                                                                                                <term>

                                                                                                                                ...

                                                                                                                </term>

                                                                                                                <listitem>

                                                                                                                                <itemizedlist>

                                                                                                                                                <listitem>

                                                                                                                                                                <para>...</para>

                                                                                                                                                </listitem>

                                                                                                                                                <listitem>

                                                                                                                                                                <para>...</para>

                                                                                                                                                </listitem>

                                                                                                                                                <listitem>

                                                                                                                                                                <para>...</para>

                                                                                                                                                </listitem>

                                                                                                                                                <listitem>

                                                                                                                                                                <para>...</para>

                                                                                                                                                </listitem>

                                                                                                                                </itemizedlist>

                                                                                                                </listitem>

                                                                                                </varlistentry>

                                                                                                <varlistentry>

                                                                                                                <term>

                                                                                                                                ...

                                                                                                                </term>

                                                                                                                <listitem>

                                                                                                                                <para>...</para>

                                                                                                                </listitem>

                                                                                                </varlistentry>

                                                                                                <varlistentry>

                                                                                                                <term>

                                                                                                                                ...

                                                                                                                </term>

                                                                                                                <listitem>

                                                                                                                                <para>...</para>

                                                                                                                </listitem>

                                                                                                </varlistentry>

                                                                                </variablelist>

                                                                                <screenshot>

                                                                                                <mediaobject>

                                                                                                                <imageobject>

                                                                                                                                <imagedata
fileref="images/screen_2.png" align="center"
format="PNG" />

                                                                                                                </imageobject>

                                                                                                                <caption>

                                                                                                                                <para>

                                                                                                                                                ...

                                                                                                                                </para>

                                                                                                                </caption>

                                                                                                </mediaobject>

                                                                                </screenshot>

                                                                </step>

                                                                <step
performance="required">

                                                                                <para>...</para>

                                                                </step>

                                                </procedure>

 

Sample 2:

 

                                                                                <step
performance="optional">

                                                                                                <para>...</para>

                                                                                                <screenshot>

                                                                                                                <mediaobject>

                                                                                                                                <imageobject>

                                                                                                                                                <imagedata
fileref="images/screen_2.png" align="center"
format="PNG" />

                                                                                                                                </imageobject>

                                                                                                                                <caption>

                                                                                                                                                <para>...</para>

                                                                                                                                </caption>

                                                                                                                </mediaobject>

                                                                                                </screenshot>

                                                                                                <para>...</para>

                                                                                                <substeps>

                                                                                                                <step
performance="required">

                                                                                                                                <para>...</para>

                                                                                                                                <screenshot>

                                                                                                                                                <mediaobject>

                                                                                                                                                                <imageobject>

                                                                                                                                                                                <imagedata
fileref="images/screen_search_field.png" align="center"
format="PNG" />

                                                                                                                                                                </imageobject>

                                                                                                                                                </mediaobject>

                                                                                                                                </screenshot>

                                                                                                                </step>

                                                                                                                <step
performance="required">

                                                                                                                                <para>...</para>

                                                                                                                </step>

                                                                                                                <step
performance="required">

                                                                                                                                <para>...</para>

                                                                                                                                <screenshot>

                                                                                                                                                <mediaobject>

                                                                                                                                                                <imageobject>

                                                                                                                                                                                <imagedata
fileref="images/screen_results.png" align="center"
format="PNG" />

                                                                                                                                                                </imageobject>

                                                                                                                                                                <caption>

                                                                                                                                                                                <para>...</para>

                                                                                                                                                                </caption>

                                                                                                                                                </mediaobject>

                                                                                                                                </screenshot>

                                                                                                                </step>

                                                                                                                <step
performance="required">

                                                                                                                                <para>...</para>

                                                                                                                                <screenshot>

                                                                                                                                                <mediaobject>

                                                                                                                                                                <imageobject>

                                                                                                                                                                                <imagedata
fileref="images/screen_3.png" align="center"
format="PNG" />

                                                                                                                                                                </imageobject>

                                                                                                                                                </mediaobject>

                                                                                                                                </screenshot>

                                                                                                                </step>

                                                                                                </substeps>

                                                                                </step>

 

Thank you in advance.