I experienced a bug two days ago ; I already reported it to Florian via Email, but I describe it here too.
It comes apparently from a corrupted file that I've downloaded with Azureus, among others.
This file is unplayable, undeletable (neither in Windows Explorer nor MP3Tag) and the balloon tip in Explorer shows no information, I can't even use Unlocker to erase it.
But it's present, I can see its size, its tags, its length...
MP3Tag v2.40 crashes when I try to retag the file, and shows me an error message when I try to delete it ("Cannot delete file", then "Can't delete the selected files").
It also can't be relaunched without crashing... I need to restart Windows.
With the latest build (v2.40d), it still crashes but I can relaunch it just after without any problem.
I'd like to send you the file in question, but I can't ; its can't be used, moved, deleted...