1.SuperAA  with CrossFire in HDR mode is not enabled.  If you have SuperAA enabled you will get the quality and performance of one card as opposed to two.

2.Rendering issues with grass shadows

3.On an ATI Radeon X1600XT CrossFire configuration, the game may intermittently crash if the resolution is set higher than 1600x1200

4.On an ATI Radeon X1900 series card, the game may crash while task-switching between the desktop and game (alt-tab).