i have exactly the same issues, even the IDLE issue.
I Updated 2009 Macbook pro 17" 10.6.x to late 2011 [8,3] 17" 10.7.3
did the migration assistant trick ( worked well , had to upgrade old machine to 10.7.3 first then migrate but worked fine , i think .. )
I have two thunderbolt displays and 3 USB/DVI displays using Diamond BVU195s.
This is the same setup ( bar the thunderbolt ) that I was using on the old laptop, no troubles prior.
Being more specific.
1) When I reboot and the login screen appears a second later it goes into the screensaver.
2) When I logout the screensaver appears on the login screen and will not let me login to another account
3) the Screensaver activates randomly while I am using my machine
4) Some applications ( Skype and Adium in particular ) seem to have lost the ability to know that I am NOT idle
5) When I remove the DisplayLink extensions all back to normal.
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