I would have posted it in bugs as well, but part of the purpose of threads like this, for me at least, is to check and see if it's just ME and my system doing x/y/z - that's happened a couple times for me, or I've just had things set wrong, or been doing whatever incorrectly as well. Having others confirm that they are seeing the same thing, IMO, is a good step prior to posting in the bug reports area.
Anyone find a good pixel density setting? I've been jumping between 1.3 and 1.7, trying to find the best blend of looks and performance. Also been messing with turning off environmental reflections, shadows, AA, and so on as well. I find that AA and pixel density settings of 1.5 and higher don't get along as well. Sure looks a lot better at 1.7 than 1.0, but I find the FPS are down from the 90 to 45 a lot more of the time.