When I record using the in game recording, the "images" in the compressed movie are coming out as blocks of vibrant colors. please see screenshot here:
http://i40.tinypic.com/25ja3gl.jpg

Audio in the movie is fine, and there doesn't seem to be any indication of a problem in game during recording or compression.

The problem persists when I change resolution and quality. I'm only being given one codec option (h.264), but I recall there having been more in the past.

My computer specs are as follows:
iMac, OS X version 10.8.3
processor: 3.4 GHz Intel Core i7
memory: 4 GB 1333 MHz DDR3
graphics: AMD Radeon HD 6970M 2048 MB

I used to record on this computer all the time in Cataclysm, but haven't tried in MoP until just now.

Please help. Thanks!