Same here. When switching to desktop version, the DIV that contains the WPtouch switch stretches vertically across the entire page. This isn’t annoying, it’s unusable. I assume it only fails on some WordPress themes otherwise everyone would be complaining, but I can’t find the cause.
Here is a screenshot: https://picasaweb.google.com/lh/photo/RTGoGXbuSMPJPP6f3FcVtH_L1LgNz2OmZ7FM0NQYklM?feat=directlink
Notice the empty space above the top page content as in daverage’s screenshot above.