I was logged out in uldah, hit shutdown game went through normal shutdown procedure.. then locked up then popped up program unresponsive and needs to close.

CPU: Intel Core i5 760 @ 4.0GHz
GPU: EVGA GTX 660 Ti 2GB 331.82 WHQL
RAM: 8GB 1944Mhz G.Skill Snipers
HD: 7200RPM 1TB Seagate 32mb cache Sata 3 6gb/s
PSU: 850W XFX BES Black Edition