If that happens again, go back to the site where u came from (most of the time one step back in browser history). It says something like document is not avaible anymore, press F5 and then something like "send again". Sorry I don't have my browser language on english, so I don't know the exact words.
This will at least reset it back to your last preview action.
So this is not a fix, this ist just a way to handle the current situation.
Duh Duh. I'm afraid this is crappy english, but can't do better now lol
