I've looked at the old and new registry key created by 13.3 beta 2 and it does look a bit different now. I was expecting it to look exactly the same but there are a few changes to it. Which appear to explain why I'm not having a problem. I would guess that your problem maybe related. However, the only way I can see making sure that the registry key is properly changed to accommodate the new drivers is to completely remove it (0000 key) and use windows default video key (0000 key). Which is shared by both windows and the drivers. Which was explained in my previous post.