On the quest to kill the corrupted hearts in Act 2, before the most recent patch the game would hang my system (only CTRL-ALT-DEL responded and "Sign Out" to get access again) when I killed the 2nd heart. I did this multiple times for me. Well, after this most recent patch, things were better. Now it did it after the third heart.

I'll play something else until the next patch and try again, since I'm not able to advance.