I'm getting a similar problem to the one reported by others previously.
I'm getting only half a screen of video, the top 25% appears correct and the 25% that should appear below the midpoint is then stuck above the midpoint. The bottom of the preview is just black.
Running Win7, Creative Live Cam Chat HD with latest drivers.
Nvidia GFX cards with latest updates.
OK found the solution, will copy it here in case someone else needs it.
I did the first bit, the 'let the 3d app decide' setting in the Nvidia Control Panel, restarted Skype and all appears well now.