MAME crashed for sure.... Your always up front gui still running. But GameEx doesn't respond. Most certainly a bug in GameEx. If I run a MAME game only via GameEx, it will run for days. I tested that, that actually works. Let GameEx launch stuff via screen saver, box will die in a short period of time.... maybe 20 minutes or so... sometimes maybe an hour...., the box isn't dead, just the always on top GameEx gui is taking over or GameEx died, hard to say which, but only a reset will fix. If I run my game program it never dies.... but I like GameEx launcher and gui, please fix the bug. nothing to do with memory.... Send me a message offline and lets debug this.