So I don't know if this is a problem with Aero Glass or Start Is Back, but I only get this problem when both are installed on the same machine. These grey boxes show up around start menu items as well as on the sides of notification area icons. It is not screenshotable so I had to use my phone camera. (Keep in mind that it doesn't matter which start menu style you use, the problem remains. I just used the W7 style to show it better)