Hi! I have installed Parallels build 4128 on my MacBook Pro 2.4GHz, and now my Windows 2000 and XP virtual machines created with build 4124 does not work with VT-x checked. They get stuck in the loading screen. Trying to boot in safe mode does not help. If I uncheck VT-x then they boot just fine, but then it's running very slow. With build 4124 I did not have this problem. I first tried to do an upgrade from 4124, then i tried to uninstall and then reinstall 4128. I also tried to do a clean OS X install and 4128 as only other application, but no luck, same problem. I managed to load Vista and NT4.0 successfully with VT-x checked though. Vista is very slow. There was supposed to be some 3D support? I wouldn't want to try that, hehe.