Running the document sample, I noticed that if an HTML file has multiple lists with a mixture of <UL> and <OL> tags, although the HTMLSample converter correctly adds a new list to the container and sets the appropriate bullet properties, the rendering throughout the document for the list bullets is the setting for the last list added to the container. You can see this if you add the following text to the  end of the Resources\Converters.html file of the sample:

<OL><LI>This is a list using 'ol'.</OL>

<UL><LI>This is a list using 'ul'.</UL>

All of the lists will now use bullets (the <UL> style). I'm using 10.1.20101.1007.