Whilst using a slightly tweaked version of the 'panes' view scheme, I tried to delete an album, simultaneously from the Library and from my hard disk. Ordinarily, I'd select the individual tracks, press delete, and tell MC to delete the library entries and the files from the hard disk. This time, since I wanted to delete an entire album, I right-clicked on the album's listing in the 'albums' pane, and clicked delete, telling MC to remove the files from the hard disk. Well, MC then froze, and after a minute or so I force-quit, through the task manager. Long story short: I later discovered that whilst MC had been 'frozen' it had in fact been busy deleting ALL of the music that belonged to the same genre as the album that I was trying to delete (which, oddly, hadn't been deleted). It had all vanished, in (roughly) alphabetical order.
Anyway, it's not such a big deal for me on this occasion - I'm backed up - but it struck me that, whatever happened, it needs addressing.
This is the only problem I've ever had with MC, and I think it's a really fantastic piece of software, but clearly there's a problem somewhere with the latest version.