Hi, I've been reading around but so far I haven't found nothing similar to this, so here goes the issue I'm having since I installed AMD Catalyst 14.4 drivers: As you see in the video the problem seems to be related to lightning (you'll see some objects/textures don't seem to be affected by it). Depending on the track, sun position, etc. the frequency of the flickering changes, and in some cases it even disappears completely (despite sadly this doesn't occurs very often). No need to say this makes this sim unplayable for me at this moment. I've got a couple of ATI 6870 cars in crossfire mode. I've tried enabling and disabling HDR and many other graphic enhancements without any luck. I've also tried changing settings in the Catalyst control centre but i got the same result. Any ideas?