I have bad screen tearing in gimp 2.8 in windows 7 x64, making it almost unusable! (see youtube link: http://www.youtube.com/watch?v=obN-ox8-n1w look around 15 seconds into the video )
i just reinstalled windows after using linux for a few months , gimp worked fine in linux (ubuntu x64) with the same hardware. i had the problem before in windows and i have it again with a fresh install
i have tried gimp 2.8.0, 2.8.2 and the same problem with the new one (2.8.4), same problem aswell with gimp 2.9 development builds. gimp 2.6 works fine with no screen tearing at all.
hardware specs:
CPU: Intel® Core i5-2500K CPU @ 3.30GHz (3292.53 MHz)
Memory: 16368 MB
OS Version: Microsoft Windows 7 64-bit Service Pack 1 (Build 7601)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GTX 460/PCIe/SSE2
Graphics Driver version: 310.90