I have the impression that the Term editor is broken in the latest build: when I click the Delete button, the dialogue box isn't closed.
I'm also under the impression that there's something changed in the way regular expressions are processed, causing problems here with term recognition. I'm not sure what't the problem, yet.
You can try downgrading to CTE 10.8.2 version and check if the issue occurs there. The only change in the 10.8.3 update with regular expressions is the possibility to convert non-translatable fragments (e.g numbers or dates).
Thanks for getting back to me!
For now, I empty the non-translatables client glossaries at project start and I start anew. When I have time and desire, I'll look into it.
Much like the way you work :)