Can tag/rate some but not all files in Bridge

I was tagging a folder of files (all pdfs, not huge) just fine until today. I can still change tags/ratings on files that already have them, as well as other things in other folders, but not the remaining 30 or so files in this folder. They are not locked, I have read and write permissions on the files, I just can't tag/rate them.  I'm up to date on the program, I've tried the short cut keys or tagging them through the menu, I've tried it with the "require command key" off or on, I've cleared my cache multiple ways, nothing. I've filtered through plenty of other similar but not quite scenarios to mine, and my own troubleshooting hasn't gotten me anywhere. Any other ideas?