Cannot edit tab stops in Paragraph Designer in custom templates
I need to add some bulleted lists in my templates, but I cannot edit the tab stops using the paragraph designer. Every time I try, the changes I make reset to whatever was there before. This is happening in every file that uses custom tags, not just one, and it affects all the custom tags (and they are all custom tags).
Editing tab stops in the default templates provided by Adobe is working, which I find supremely weird.
I have MIF-washed the files.
I have restarted FrameMaker.
I have restarted the computer.
I can make these changes by editing the MIF files, but that gets tedious and, seriously, why should I have to? All I can think is that, somewhere, a setting got changed but I can't imagine what it might be.
All template files are stored locally.
FrameMaker is up to date (15.0.4.751)
Windows build is: 10.0.17763.0
The only system changes were updates made to 4 CC applications yesterday (Photoshop, Illustrator, InDesign, CameraRaw).
ETA: I have a workaround. I open a new document based on the Adobe Portrait template and delete all its paragraph tags, then import the paragraph tags from my template file and create the new/changed formats I want, save the file, and import the updated tags back into my template file.
This is really, really weird.

