IChat disconnects when external monitor connected to Macbook Pro.

Downloaded latest OSX patch last week (Thunderbolt patch).  Now, when connecting my HP external monitor to my Macbook Pro (2011), iChat will only stay connected for 2 to 3 minutes.  If I disconnect my external monitor, iChat will stay connected all day long.  This just started last week after loading the latest SW upgrade.  Any ideas?

I am not going to be much use here.
I don't have a computer with Thunderbolt.
The computer I do run a second screen on is a G4 running Leopard and in the Energy Saver there is no setting for the second screen to be set independently than the main screen.
I think it may pay to ask again in the Lion Forum Community.
8:03 PM      Friday; September 23, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb( 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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