Patch 1.4 seems to break something in the AMD graphics configuration. I'm using crossfire 5850 cards and after update, frame rate dropped like a rock and also min/world map is flashing like crazy.
- I repaired....nothing
- then i set game to full screen windowed, fixed the mini/world map flashing
- then i set Catalyst driver to **disable** Use Application Setting for antialiasing, texture mapping and tune mipmapping for performance.
seems better...not sure if "crossfire" is broken now that AMD driver is taking control of the antialiasing and texturing job and the frame rate seems to be as pre-patch.
Worked for me, btw I dont have X fire but had same problem with single HD 5970