We just rolled out an update that should address the following issues:
Fixed windowed mode rendering nothing on some GPU's
Fixed screen going blank when player took damage on some GPUs (ATIX1600, etc) - ie: the motion blur issue
Fixed Crossbow scope 3d view not rendering on some maps on all GPU's
Fixed Terrain rendering on systems without GL_EXT_frambuffer_blit (GMA950 GPUs)
Fixed windowed mode rendering nothing on some GPU's
Fixed screen going blank when player took damage on some GPUs (ATIX1600, etc) - ie: the motion blur issue
Fixed Crossbow scope 3d view not rendering on some maps on all GPU's
Fixed Terrain rendering on systems without GL_EXT_frambuffer_blit (GMA950 GPUs)