When I try to run the SL viewer gets locked at "Initializing VFS" -- and stops there. What to do? I've downloaded and installed the latest version of SL. I've checked for compatibility with Windows 7. All my other graphics programs (videos, photos, movies) run just fine on this computer. I can't find either "Initializing VFS" or just "VFS" in SL Knowledge Database. Can anyone help, please?