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Everything works now with 1.1.25, even VFX, Shaders and Shadows set to Ultra High.
What does not
What was not tested
I've got a weird crash when loading a map first with shaders set to ultra high, however I could set shaders to medium, start a map (mission or skirmish battle), exit the map, set shaders back to ultra high and then restart the map, it worked. This might be related to my system and a SELinux denial, it blocked access to some direct3d libs. I give it Platinum now since ALL graphic effects can be used in highest setting without any glitches.
Test System: AMD Phenom 9550 x4 2,2Ghz, 8GB DDR2, Geforce 9800GTX+ 1024MB, Fedora 11 x86_64, Kernel 184.108.40.206-191.fc11.x86_64 x86_64.