Bizarre Screen Display After MacBook Pro LogOut

Like many on this forum, I've had LogOut issues with my MacBook Pro -- specifically, having the screen resolution drop after logging out of any account -- the only way to correct the problem being a reboot. Many posts have offered fixes from discarding corrupt plists to changing other system preference settings. My understanding is that the problem can be solved by upgrading to Lion, though many stated that the problem could be solved by upgrading to Snow Leopard 10.6.7, which did not work. I'm running 10.6.8 on a 17" Macbook Pro (mid-2010) and have still had this problem.
Compounding matters, yesterday, I downloaded and installed the latest Macbook Pro EFI Firmware Update 2.3; Security Update 2011-006; Java for Mac OS X 10.6 Update 6; Thunderbolt Software Update 1.0 and several native Mac App updates. I've repaired permissions and rebooted and now when I log out of any account, I get a bizarre screen -- not a reduction of resolution per se, but a reduction of the entire login screen... as if the image has been reduced by 25% or so... with a big blue border around two sides. See below:
AFTER BOOT-UP:
AFTER LOGOUT:
If upgrading to Lion would solve the problem, that would be great but I run several media-production apps and third-party hardware/software interfaces that are not quite onboard with Lion so I have to wait for a Lion Upgrade until my essential programs and hardware/software interfaces are completely Lion-friendly.
Surely there has got to be a way to get rid of this problem while still running Snow Leopard 10.6.8.
Anyone?

Your appointment at the genius Bar for an evaluation is free, in warranty or out.
They can explain why it wiggles, tell you whether that is normal or not, give advice about what you can do to reduce its annoyance, and fix it if it is not normal. That is what they are trained to do, all day every day.
There is no expectation that every time you visit they will find a way to make money off you, like a car dealership.
The Genius Bar service exists because Apple wants you to be a happy customer, if possible. If you are willing to make an appointement and come to them (spending your time and energy to do so) they will work with you for nothing in an attempt to solve your problems, whatever they may be.

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Bizarre Screen Display After MacBook Pro LogOut

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