I am running RTM version of Windows 8 Ent x64 and my Start Screen went blank after I added a shortcut to the start menú (on Appdata). I had already added shortcuts before and worked as intended, but now it appears empty.
I should also note that when you search for an App (not on Settings on files or anything else) it does actually search but there appear no icons (even though you can simply click enter to play).
The rest of Windows funcions work as intended, you can have 2 Apps on the screen and there are no strange event logs. As a side note should also say that the screen appears without the drawing when you access it, but that it will appear with the drawing if you do search an app, quit the search and then open the start menu.