White block on top of photos (top left corner)

I'm suprised that the same problem now also happens with discrete amd graphic cards. Before I thought it is APU specific. However, this might help:

"This is a problem that occures on systems with an AMD APU (e.g. A8 7600, A10 7850k, Athlon 5350 ...). The last working AMD dirver (in my knowledge) was the  14.11.2 Beta (14.301.1013-141117a-177876E, apparently a driver from november 2014). I'm using this driver at the moment and everything works fine (except that I can't use new amd drivers, that means I'm missing new driver features!).

Since that, every driver(called "omega" drivers) made problems with JPEGs. First there were broken (e.g. black) thumbnails in Windows. The photo gallery crashed upon creating any thumbnails. You could use a workaround: deleting or renaming the JPEG-decoder files od AMD. Then Windows used automatically its built-in JPEG-decoder (a part of the so called "windows imaging component"). The last remaining problem was (and still is) the issue with the white or chess-board-like blocks in the image viewer.

Recently, the JPEG-decoder-bug was fixed by the last drvier-update (15.7 WHQL driver). But the issue with the white or chess-board-like corner remains. Thus, you still have to go back to the last stable catalyst driver before the omega-drivers!"

Kind regards