I played a bit more just now, and came across items with no name, just a number - suspecting corrupt files, I did Steam verification and it reported a few files that didn't pass verification and were reacquired (in addition to some of the glossary files I had edited myself). So that save had more problems than just this - as I wasn't very far into it, I just started a new game. I did have a complete lock-up while playing URW a while ago (not related to URW, but a background process), and it must have messed up some files. So perhaps just a false alarm, but I'll keep an eye out if something like this happens in this save.