Im in the same boat as Ben.
We rendered out again, mind you 6- 7 hours later without maximum bit depth and without the maximum render quality ticked which don’t really do much but give you a better color space, I still got errors.
The funny thing is that if you render out , say in my case 10 minutes of the 75, you get no errors. ( Did this to test different scenarios, toggling on off max render quality and bit depth to see if those where giving me errors, without having to spend the full render time )
So it has to do with rendering a certain file size or length. In my case I went from a 2k timeline 2:1 Aspect to codec ProRes 422 HQ 1920 x 1080 while using the mac pro specs, and the newest AMD Firepro drivers with the newest OS iteration. Tried both 10.9.3 and 10.9.4 beta. I have yet to time machine back to older Mavericks , but why bother.
Adobe needs to look into this. Apple needs to look into this. AMD , wasnt expecting much from the card anyways, but I don’t think its the card, but rather compatibility.
I am transferring my project to avid media composer. Should have used this to begin with.