After some difficulty upgrading my 4HD RAID0 2.66 MP to SL I've discovered my full screen Hulu and WB browser video is choppy if I use a full screen pop out window. If i go full screen it works fine. I've checked my Internet speed and it is as good as ever. I have not changed my config. of three LCD screens or any other hardware. This problem happens in both Safari and Firefox. I did have to reset the PRAM in order for the SL installer to see my RAID0 HD per Applecare. The bottom line is I used to be able to watch Hulu via a pop up expanded to the edges of my 24# LCD, and surf using one of my 22 inch screens. Now I can't unless I want the video and audio dialog to sych. Any thoughts? I did confirm the the main Radeon 3870 card is still running at 16X. Could this be driver problems?