Problem with flashing screen in clamshell mode

Running Mac Book Pro with 32" Samsung TV
DVI / HDMI connection
It was working okay for months.
I dont recall doing anything or connecting anything that woudl have changed the setting.
Laptop Screen is stable.
During clamshell and open mode (mirrored or not) TV screen is constantly flashing on and off like its refreshing.  Its so bad its impossible to write a sentence.
Tried powering everything off, detecting monitors, resetting TV, changing resolutions, changing HDMI cable and HDMI DVI ports.... nothing works. 
I have spent a day trying to get this running again.  Any ideas? 

carlfromchicago - I too am encountering the exact same issue. I have a MBP 17" 2.3 GHz i7 Core and am trying to use the Henge Dock to reduce the clutter on my desktop. To add to it, I also am using the Matrox Dualhead2GO DP edition to utilize dual monitors for MBP. The external monitors work perfectly fine as long as the MBP lid is open. It will also work intermittently as other users have encountered as well in this forum.
I know there was a software update on 06/23 for the Mac OS to 10.6.8 and then there was a Thunderbolt Firmware update on 06/30. Unfortunately, it did not resolve the issue for me. It still acts flaky I have yet to be able to use Henge Dock and at this point, from all the forums I've read, I think it is an Apple issue.
I am actually in the process of downloading OSX Lion so we'll see if this addresses the issue.

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