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I have a MBP with Lion 10.7.2 with an external monitor. When I disconnect the MBP from the external Monitor or when I reconnect it, some application show incorrect gamma color.

It is very difficult for me to explain the aspect variation, but I can solve the problem going into the Monitor preferences -> Color profile and choose the profile of my monitor. This work for Finder and Mac app, but no for other application such as Chrome, that I have to close and restart.

I try to put an image with the incorrect color gamma:

enter image description here

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Try keep pressing command-option-control-comma

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what is this command? – robob Jan 8 '12 at 11:20
ok, I found it...but it doesn't change anything (but the gamma yes). So maybe It doesn't be a problem of Gamme... – robob Jan 8 '12 at 11:24
Really? Because that does sort of look like the contrast problem. Try going to System Preferences - Universal Access - Seeing - Enhance contrast and check if the slide bar is at normal. If it is and the problem is still there, I'm afraid I can't help you. – theAmateurProgrammer Jan 8 '12 at 11:28
Nope...But changing the color profile (select another one and reselect the monitor's one) solves the problem. It's very strange... – robob Jan 8 '12 at 12:26
+1 Thanks, this has fixed my problem! If you are even in London I'll buy you a beer. I've been going NUTS with this issue for weeks, maybe a few months now! Was starting to think my display was broken as I couldn't resolve it though changeling the display profile, I must have mashed command-option-control-period at some point! – Iain Collins Jan 17 '12 at 0:09

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