We are having a strange case.
User "A" logged into our web-system (ASP.NET MVC, Forms Auth), was working for some time, then his user name changed to "B" after "B" logged into the system.
That case is very critical — user can't see data of others.
Does anyone have any ideas? Please!
FINALLY:
We've decided it is a bug somewhere in ASP.NET, IIS or wherever more.