I have tried regular SL Viewer, Firestorm and Singularity all with the same result. Starts and loads without error but instead of seeing the Login screen I get a blank white screen. I know the login is there because if I start task manager (Win 7) as windows reverts from the ctrl-alt-del blue background back to desktop, the login screen appears but I cant enter anything. I got lucky one time and was able to at least enter my username but cant progress any further. Can't tell if it s hardware or other problem - effects all viewers Thanks