Randomly Missing Text in PDF Created from FrameMaker

This problem relates to a structured FM document, but I suspect it might be a general issue and have posted it here in the general forum for that reason.

I am generating PDFs that are missing text somewhat randomly throughout. I tried searching the forum for solutions, but none of the suggested fixes worked and none of the posts specifically addressed the issue I am experiencing.

I am working in structured FM. The templates we use were originally created for FM8. We use both FM8 and FM10 in our work group. We are able to duplicate the same problem in both versions and on multiple computers.

I thought I had narrowed the problem down to certain paragraph formatting, since it only ocurs in three or four paragraph formats (a bullet list, table text, etc.) Garden variety formatting. But in most places in the document, these formats appear perfectly. The strangest occurence is a single intance where the page number is missing from the footer.

I thought it might be a font issue, as I've had similar issues in the past. I had a missing font warning in the console, but I am pretty sure that this has nothing to do with it, since they are fonts we are not using and all the other text from the same formats appears.

I tried turning off "Remember Missing Font Names" in preferences. No help.

I checked that the fonts are in the local directory and appear as embedded subsets in the PDF.

I also tried checking and unchecking the "Rely on system fonts only; do not use document fonts" option in the PDF output settings. Also no help.

The randomness of the missing fonts bewilders me and I've exhausted my own troubleshooting abilities. I would be happy to share a source file if anyone thinks they could help me that way.

Thanks in advance,

Douglas