Same issue here, a few differences though. Not using maximizer at all, just minimizing the windows to task bar. Then they lock up and show nothing, but if i close a couple of my instances i have open via keyclone the unclosed windows reappear. Seldom can get more than three windows to function properly. I run a Phantom quad core and all four CPU's max out as the windows lock up. After i close one or two they go back down. Is this a CPU issue or KC issue? Prior to the patch I could run five instances with the occasional "Cannot read error". To be expected I run five version from one HD. I have all the settings set to the lowest possible setting as well. After minimizing the windows two + times they lock, Then the border pops up with no video, they all lock? Any ideas? Again I am not using PIP or maximizer on my system just minimizing to system tray then they lock.

Q6600 @2.4 Ghz, 4 Gb of ram, Palit HD 3870 video.