I've tried installing MM4 as a portable installation and as a standard install. The behavior happens on either. I've tried uninstalling and re-installing, and this behavior starts happening after a few executions, and once it happens, it happens every time.
On execution of media monkey, regardless of the /nosplash flag, the application starts, loads my library and places me in the same place in the organization tree as when I last quit, and then hangs. I've let it sit for over an hour, and its memory footprint doesn't change and it barely registers any CPU usage when i check performance counters, so it does seem to be truly stuck.
The only thing I can think that might cause the crash is that I'm removing duplicates and correcting tagged information. Is that causing something to fall out of sync?
(Windows xp 64bit SP 2, 4G ram -- not that MM goes over 64M, Inter Core 2 Quad Q9550 -- not that my CPU usage goes over 10%, around 6k media files, mostly audio and most of those are MP3s, a couple-dozen podcasts and a handful of audio books)