Color management on an external display

I'm using a ColorEdge CE210W monitor as an external display for an Apple MacBook, and I'm having trouble getting images to display on the CE210W consistently *across applications*.
According to OS X's ColorSync Utility, the CE210W is the default display (it's the one with the OS X menu bar). OS X's System Preferences utility confirms that a reasonable color profile is selected for it. (The MacBook's built-in display uses it's own profile.)
As a test image, I have an 8-bit RGB TIFF with an embedded sRGB profile. I'm displaying the image only on the CE210W; I do not use the MacBook's built-in display. It appears differently in OS X's Preview application and Adobe Photoshop CS4. I'm using Photoshop's default color management settings, which means that the RGB working space is sRGB. Photoshop seems to confirm that it's idea of what the monitor's profile is what System Preferences says it is. I can't see a reason why the two programs wouldn't agree on the display of the image.
Now, suppose I log out, unplug the monitor, and log back in. When I open the same image again in Preview and Photoshop, now the two programs display it identically.
Does anyone have an idea about what's going on here? With the CE210W plugged in and set as the primary/default display, I've tried to make sure everyone agrees on the monitor's profile and working color spaces, but somehow images don't display identically in different programs. Without the CE210W plugged in and using the MacBook's display, everyone happily agrees.
Message was edited by: briaydemir

Having read here and on other threads about 10.5.7 causing problems, etc.....
I decided to try to boot my new MB White (Apr 2009) with another external startup drive that contained 10.5.6. (I have a small problem where the DVI mode overscans the external monitor and it clips the top tool bar}.
Only trouble was, it was from my G4 iBook (2004). So I expected the white MB to reject that iBook G4 startup disk.
It did not. It worked as is with no workaround steps needed. Oh, I then tried that DVI mode but that didn't fix.
Sometimes things just get weird.

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