To solve the graphic glitches which sometimes appear in some stages in hardware rendering mode (cars with rainbow colors), before the race starts and while the camera rotates around your car, select software mode (F9) and then select hardware mode (F9) again.
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i7 [email protected], P8P67, ASUS HD7870 CUII, 8GB 1600 GSkill, Win 7 Ultimate 64-bit