Some you may remember the post according the graphic issues I had running DiRT 3 in split-screen mode. The solution posted in this post was wrong. The cause for the weird shadow and also the over exposure weren’t Fraps. The issue appears while having “Ambient occlusion” on switch “High”
When you switch to “low” or “ultra” the errors in split-screen mode disappear. Of course will the ultra setting cause a performance decrease, especially on entry and midrange systems. Consider lowering the shadow details if you want to keep ambient occlusion on ultra settings. It could make a difference of almost 15 – 20 per cent if you’re running the game in 1920×1080.