[Eric Feller] "I don't see any signs of bad graphics card"
Is not about a faulty graphic card, but about power.
I have two MBP, one 4 years old and the other one year old.
The old one fails many times on rendering some MB presets on Prores 1080 stuff.
If I apply the same effects on 720p stuff or I set 8b YUB rendering, it works.
It would be great if they would implement again the optional "CPU rendering" from the first MB versions.
Have a look to NVIDIA or ATI to see which options are available to your Mac.
rafael
http://www.nagavideo.com