I have been having a problem with my computer(laptop) when using the Windows 7 Ultimate Basic Theme.
The problem I'm having is that, whenever this theme is active, and I move one window over another, I get this "frame lag". That's as close as I can describe it, here is a screenshot:
The amount of frame of the application that it "lags" onto the underlying application varies. As an example: When I'm using 2 notepad Windows, there's only a tiny bit of frames that get left behind, and when any window is moving over and Explorer window, it's a lot of frames. The "left-behind" frames clear every .8 seconds or so, which also constantly varies between programs.
This only happens on the basic theme. Works fine with Aero. My video card is perfectly capable of rendering this. I can run Crysis just fine. It's an nVidia 9600M GS with 512MB of RAM (M ofcourse meaning "mobility" as it's in a laptop.). I currently aslo have 2 FullHD monitors connected, but it also happens on the native laptop screen with a moderate resolution of 1440 x 900. All the latest nVidia drivers have been installed.