Well the server is purrty much communicating to your game, so there might be a command when you leave the server ie "On disconnect do this" which will cause the game to crash. I'm sure it's a simple fix. I get the crashing prob but it's no big deal on my end since I only play at N/U and only quit once I'm done. Click "Close the program" and it closes fine.

btw for N/U Tech I run Window7. Hope that helps. ;}