RE: Optiplex 9010 AIO Screen goes black and freezes on logout.
"straight out of the box" ... are you using Dell's CFI or imaging service? Although since you mention you've replicated the lockups with a fresh copy of Win7 I guess it doesn't matter. How many logon/logoffs did it take for you reproduce the issue after the fresh Win7 install? I've been able to reproduce it routinely on a machine getting the application event 1530 errors, but on the fresh install of Win7 machine, I've tried logon/logoff probably close to 100 times and can't reproduce the issue yet.
I've now looped in MS and they're having me do further troubleshooting in an effort to determine if it's something in our setup causing the issue on this particular system hardware. Will update with more info.