Mirroring Macbook Display on HDTV

Hey,
I have my macbook connected to an HDTV through a mini dvi to HDMI cable, and it has been working great. Suddenly though, when Mirroring is on, the image on the TV is very strange, like the colors don't match up, and there are a lot of green and red blobs on the screen—sort of like what graphics were way back in the day with the old Commodores.
The image is fine if mirroring is turned off—any one know how to help me?

The mirroring selection is in the "Arrangement" tab and only shows up on the MacBook Pro LCD, not the external display.

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