I've got a mid-2010 MBP with NVIDIA GT 330m i7 2.66GHz I've had this problem for a while and didn't think it serious enough to contact Apple, maybe that was a mistake. Anyway I keep seeing this (image below) all the time using any browser (mainly Safari or Chrome) and a hell of a lot when watching videos. Any ideas what the problem is, or anyone with similar issues? I've noticed it on every OS X since Snow Leopard. Thanks 1. 2. ... and as I was making this post! 3.