Windows 7 computer using Editor 2.0.
At rare times I’ve found I can no longer type anything into the editor. It just responds with the Windows “ding”, signaling that the character pressed wasn’t accepted.
This may be a cause of alt-tabbing out of the editor, although it’s only happened a few times to me, and I alt-tab quite a bit. I tried saving to see if that would “refresh” the editor, but it did nothing. Restarting fixes the problem.