Empty Glossary in CHM; Glossary tab is there, with white fields, just empty of terms/definitions

I've read through many similar problems, and tried the solutions, but this seems different.

First: HHActiveX.dll is registered (both 32 and 64). Plus, I can open other (multiple) CHMs and see the Glossary tab full of terms and definitions.

I have a project (I'll call Project X) I worked on a couple months ago. Then, it published (multiple times) with a Glossary. No problems. I just today had to update some text (just text) in a couple topics in this project. I made no changes to anything that should affect the Glossary in any way, or how the project publishes. But publishing the CHM today: the Glossary tab is present, but it is empty of terms and definitions. (It is not a grayed out area -- it has the two white fields where the terms and definitions usually appear, but the fields are empty of text.)

Previous versions of Project X CHM (kept in version control) open with the Glossary showing properly. Only the versions I'm producing today are missing the Glossary terms/definitions.

I have today test published multiple other projects (Projects A, B), and those CHMs have their Glossaries showing properly. Old publishings and today publishings.

That is:

Project X published previously = OK

Projects A & B published previously = OK

Projects A & B published today = OK

Project X published today = No glossary text

I have even imported the X glossary into A & B and they publish fine (showing the glossary terms). I have even directly copied the contents of X glossary into A glossary file, and A publishes with the glossary terms properly. I have tried publishing X with A/B glossaries, but the glossary still shows empty. So it doesn't seem to be a problem with the glossary file, itself. The trouble seems to be with how X is publishing (today, and specifically CHM).

I have compared all my output settings between X and A/B. I can't find anything different between them that would make A/B work, but X not work. I have published X as a WebHelp Pro, and the glossary terms show as they should. It is only the CHM that fails to show the glossary terms.

Please help.

Thanks.