Cubase 6.5 Audiowarp quantize crashes


I recently upgraded to Cubase 6.5.0 (64 bit) and Ive been finding it to be pretty unstable in general particularly with the warp quantize. On one project I am trying to quantize some drums and select the three tracks together, hit quantize on the quantize panel and cubase just hangs. I can’t even get Windows task manager to shut it down- I have to restart the computer.

Im using Cubase 64 v 6.5.0 with Windows 7 Home edition. Does the upgrade patch deal with this issue?