I too have locking up lock screens....
As far as I've been able to tell, the system is active, it just won't flip to the active screens.
Disconnect the USB display, and within seconds, the desktop will rotate into view, and I can plug the display back in.
Relevant info:
OS X 10.7.2
Macbook Pro 17" Radeon 6750M Set to discreet only.
I also have Parallels 7 installed, and the issue seems worse when it is running.
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