It often happens to me that when I use autofill from TM nothing is filled in despite the fact that when I go to some messages, they have 100% TM suggestion. I use option to fill all exact matches and mark them as fuzzy. Reproducible: Always
It seems to be caused by issues in TM. Maybe after update from 1.5. After I tried to purge Lokalize configuration wherever possible and regenerated TM, it is now working.
Yes, I have seen it happen as well. However, if rebuilding the translation memory fixes the issue, maybe we can close this?