I was using AVR Studio, and I got a blue screen. It was caused by windrvr6.sys. That's the freakin' Jungo driver. Jungo drivers used to be junk. I guess they haven't gotten any better.
I now have it disabled.
It serves no purpose anyway until or unless I get the USB port working on my Xplain board. I'd rather just hook my PC to an Xmega USART with my RS232 level converter.