OS: Windows 10
Antivirus: Windows built-in
Files: Mainly FLAC, large library, files on NAS, MC library is on local disk
I have previously disabled Windows virus & threat protection with no change, and have been trying to figure out this issue for a long time.
If you don't do anything in MC that takes several seconds to finish, using a fast PC, smaller library, no NAS, this problem may never happen, at least not to the point that you get the wait/quit dialog or a crash happens. As I mentioned, I can reproduce the wait/quit dialog on a fast notebook PC running a fresh install of MC30 by loading a challenging view (panes with album and track counts, durations, size). I also get the spinning blue circle briefly during normal use, but that wouldn't often become an obstacle or escalate because tasks (e.g. load a view, begin playback) finish quickly enough. HTPC behaves worse because it is slower. I do not have similar issues on the HTPC with other apps.