Display color profiles causing gamma shift in video playback

I recently got a new monitor - Dell U2713H - to use with my macbook pro. If I use anything other than the default color profiles the gamma will shift after about 7 seconds during video playback to something much cooler and dimmer. it stays that way until the video is paused and then reverts back to what it should be. This problem doesn't happen if I stick to the default display profile. Any ideas?

Mac OS X (10.6.8)
If your profile is correct, you should re-post in the Snow Leopard forums instead of Mountain Lion's.
If profile is incorrect, please correct so that you will get the proper troubleshooting solutions.

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    Message was edited by: Sherman Campbell

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