There is a strange bug, which appeared, I think, after one of the hotfixes for v2.0+
Whilst hovering my mouse over slots, attachments, images, the highlight starts to flicker like a strobe light and probably would cause an epileptic seizure. And the selection of those elements becomes problematic. Sometimes the click doesn't register and I can't select the element. Sometimes it does. Sometimes I have to wait several seconds and there maybe there is a higher chance for the click to register, but maybe not.
Bones and some other elements act normal. It's all in the Tree window. This problem is not constant, it probably happens something with updating images (but the problem occurs not with the updated or changed images, but with all of them).
We're in "get work done fast and publish" mode, so I didn't really explore this bug. But it is recurring.