I get the lock-up too from The Windows Transitions & the try it button really sets it off. I've also noticed that the animations for when you copy, delete a file are always frozen...I've just stopped using WinFX.
Since no one responds I'll give my theory: It seems to happen only when explorer.exe is modified or some other system file is changed cause I've realized that MS Update & Icon Sys Patch will cause it if I change any of those files. After Java had a update, it occured again. It was the first time in like a week, so it just seems to me that this is why.
Anyone ever figure a solution?
I am using a two themes at once however...I enable the "Always Use this Taskbar" from this theme thingy.
It just happens. I'm either surfing the web, typing a paper, creating/modifying docs. Nothin unusual.
I have the exact same problem, happens rarely but happens. And its because of my 6600GT AGP? Any updates on this topic?