Hello MacRumors people, Sorry if there's already a thread about this, but I did try to find it before deciding to post. Anyway, I've forked out for an i5 27" iMac (week 51 2009 build) and I'm happy to say that there are no problems at all with it...apart from one thing. It's not a yellow screen; it's not a flickering screen, no, it's dodgy glitchy thumbnail icons in Finder! I'd love to know whether this is an iMac issue or something completely different. Check out the screenshot. It only happens in Finder windows in Icon view. Anyone experienced this before? Is there a patch or something to fix it?