With some mesa drivers there is a wrong shadow behind some objects (example below) that goes away when disabling shadows in 0 A.D.. This is a known mesa clamping bug affecting r300, r300g, softpipe, llvmpipe, swrast mesa drivers and possibly others. Other than the original shadow bug this thread discussed also two other graphic related problems. Overall status update: [FIXED in mesa 7.11 (r300/r300g, softpipe, llvmpipe, swrast, see also mesa bug #31159) and backported to 7.10.2 on r300g only] original shadow problem; [FIXED in 0 A.D. alpha 2 (r8313)] icons corruption problem; [FIXED in 0 A.D. alpha 2 (r8288)] 0.A.D. off-by-one error giving mesa warnings; Example: