A friend of mine had the same issue. All her stuff was said to be missing and she couldn't put things off anymore. but i could see her just fine. So i figured that it's not a SL issue, but a viewer issue. I told her to delete these 2 folders: (just copy those paths into your file explorer and delete everything inside)
%localAppData%\Firestorm_x64
%AppData%\Firestorm_x64
after she logged in again, everything was working fine once more, all she had top do was to set her preferences new.
Hope this helps others.