What happens if you reinstall the original card?
Why did you change from a Nvidia card anyway?
>Catalyst Drivers are up to date (12.4)
Somewhat of a long shot here, but the newest driver is not ALWAYS the best driver
You may want to experiment with different driver versions to find out if an older driver works better for you
Going back a few years, my 1st video editing computer (Alienware when they were an independent company) had an nVidia card that would only work properly with Premiere 6 (as I said, a few years ago) if I used ONE specific driver... older or newer driver and Premiere did not work properly
If you do decide to do this, you might want to make a full boot drive image to a USB hard drive (or 2nd internal drive)
The product I use is at http://www.terabyteunlimited.com/image-for-linux.htm
Image runs off of a bootable CD via Linux (the Zip you download includes a program to make the bootable CD) and it reads EVERYTHING on the drive, even the hidden registration information, so everything is restored when needed... and you may restore the image to a brand new drive in case of a crash, and not have to re-install anything
Please note that I own no part of Image, and I don't get a referral fee (that is just a plain web link) but I use the program and it has saved me a LOT of trouble when I had a hard drive die... and I was able to restore everything and not have to re-install or re-activate a single program, from Windows on up
I had the same problem as you. What I did to solve it is flip flop my workspace. I had the video on my secondary monitor, and the timline and such on the primary. I switched so the video was on the primary and timline on the secondary. I've been editing for a good 2 hours now and no crashes! It seems that AMD drivers don't like to have video played on the seconday monitor.
Hope this helps!