I've got a strange problem (sometimes) which doesn't have to be directly connected to JJ2+ or JJ2UDP, the game appears to crash in some situations after loading a new level or returning to the title screen, it exits fullscreen mode leaving me with a black window at the top. Looking at the Windows task mananger it appears like Jazz2 is then closed from the applications list and still 'functional' under the processes tab. But I haven't found a way to put it back there so I just closed the Jazz2.exe process in those cases, and restarted the game from the beginning. I'm running the game under Vista 32Bit SP1, but I suppose this form of 'crash' happened on previous systems as well, just a lot less, I'm not sure.