No issues here on firefox, safari and ie 7and 8.
I did have that return to the login page for a bit a while ago. Follow the instructions do the manual delete in the temp and temporary internet under your usernam on windows xp. then check ie tools then delete all offline content. You will have to re enter any saved cookie information.If you cant find these locations or are not sre just download ccleaner and runit. great free tool. make sure though, as when downloadinf ANYTHING that you get it from a reputable site.