That's really weird, WebGizmos. As others have said, my first guess would be video drivers. But, of course, you've already barked up that tree. If it's something in the skin itself, it should happen with every skin I've made in the last few years. I've been making my XP start menus the same way ever since perpixel support was introduced. Perhaps there are some pesky old *.wb4 temp files in the skin folder causing issues somehow? Just a wild guess.