False color overlay on video output

EDIT:
I found out what it was. I have calibrated my monitor some time ago and the resulting colors are not applied to the overlay video mode. Bugger.

I’ve rendered out a camera mapping sequence from a jpg I found on flickr to practice camera mapping. The output avi has a very strong blue tint to it that I can’t explain:

This blue is being overlayed on a video source (this is a b/w film clip):

Now the same video source in a second player window:

The thing is, when I run the file twice with the first video player window open, the tint is gone. The second window also doesn’t use overlay, I can make a screenshot of it without trouble.

This happens with any video player, with or without codecs installed. Even when the first player was a different one then the second. I tried with VLC which gave me the same result.
The colors were correct in safe mode and when I uninstalled my geforce 8800 gts driver.

I never encountered this problem before. Anyone know how to fix it?

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