After Thunderbolt Firmware upgrade display in target mode does not wake up from screensaver

Hi!
I have a MacBook Pro 2011 (Snow Leopard) connected to an iMac 2011 (Lion) via Thunderbolt. The iMac runs in display target mode.
Last night I update the Thunderbolt firmware on both systems via SW update. Now I have the problem, that the iMac display does not wake up from screensaver mode when I enter the password to unlock the MBP blind (the iMac screen is the main display).
I have to do cmd-F2 twice (do disable and enable) target display mode to get it back to life.
This worked fine before the Thunderbolt updates.
Does anybody else have that problem?
Thanks!
Hank

I have a 2.2Ghz Macbook Core 2 Duo system purchased in December 2007. I have 2GB RAM installed.
My system has developed a weird problem where it won't come out of sleep ... 100% of the time now.
I've tried resetting PRAM/NVRAM, resetting the power module and even reinstalled Leopard. Nothing has helped. I'm at my wit's end.
When I put my system into sleep mode, it goes into sleep mode as you would expect. However, when I wake the system (by opening the lid or pressing any key), the system looks as though it's come out of sleep (ie. there's a picture of desktop) and I can move my mouse but I can't click anything. I can't Cmd-Opt-Esc either. I have to perform a hard-reset at that point.
I have quit all other applications to try to isolate the problem and I'm beginning to think it's either Leopard or my MacBook. Either way, it's annoying as **.
Has anyone come up with a way to fix this? Doesn't seem like I'm the only one.
Thanks,
Chris

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Move the mouse or trackpad cursor over the center area of the login window so you can see the user icons. Click on the icon of the user that you would like to login as, type in the user's password, and press Return.
If the login window is configured to show only the name and password fields, type in the user's name and password into the fields, and press Return (even if you cannot see the rest of the login window).
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1. Open System Preferences > Security & Privacy > General. Click the padlock to unlock the preference pane and enter your admin password. Click the Advanced button at the bottom, then see if the option "Log out after N minutes of inactivity" (where N is the number of minutes) is enabled.
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My system has developed a weird problem where it won't come out of sleep ... 100% of the time now.
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