Hi, I had this issue with KUbuntu 12.10 with fglrx driver. I use two graphic cards for five screens (HD6850 and HD6570). This issue shows only with the two cards working. If I use only one SublimeText works fine. With the fix from serialhex it works fine with the two cards running.
I have a Linux Mint 15 Olivia installed system with ATI HD7850 graphics card. It was running fine in Mint 14. But, I have updated to this version recently. I think there are a lot of compatibility issues with Mint 15.