Hi I recently got a new iMac, its been fine, but just today I have opened Numbers and some crazy colours, like a graphics problem have flickered up onto the screen but go away pretty quick, after I have clicked on a few things and stuff. They tend to be red, yellow and green colours from what i have seen. It has only happened since I opened Numbers, and its all up to date. (Version 1.0.3.) It also flickered up a little on iTunes while Numbers was open, where its has the time bar and song name and stuff. No idea why this is, hope you can help, thanks.