Ok, so I wasn't really sure how to title this post. A few months back, I recently replaced my old iBook with a new MBP (Penryn). I occasionally see problems which makes me wonder if I have a bad video card or something else. There are two symptoms that I can tell. The first is that when you scroll down a page on Safari, the text is garbled and written over each other with lines duplicated. I've attached a screen shot of that to help explain. It gets to where if you don't scroll down the page VERY slowly, words are unreadable and lines are mashed together. The other things that I've noticed is that certain things are not smooth, but will flash to white as they are happening. For example, when iPhoto at the Events level is flying through the pictures in an event in preview mode, it is not smooth, but flashes white and then the picture on each picture change. It's almost like the animation isn't smooth, but rather I'm seeing white and then the image when it should be a smooth transition. It will do the same in Safari when loading a page. As the elements of the page are loaded (for example graphics) they don't smoothly come into place, rather there is a very clear flashing of that part of the page back to white and then the graphic comes into place. Hopefully this makes sense. When it starts happening often the only thing that will completely cure it is a reboot. It appears to be "cosmetic" in that the operation of the programs aren't affected and the cpu isn't pegged, etc which is why I wondered if the graphics card is flaky on my unit. Sometimes it will get somewhat better on its own after a while, but often comes back unless I reboot which I very rarely do. Hope this makes sense, any help is appreciated.