Exception ThreadAbortException on RedirectFromLoginPage

I'm having some trouble when people try to log on my system in IE8. Before tomorrow everything is fine, but now when they try to log on the line who call RedirectFromLoginPage method throws ThreadAbortException exception.

After some investigating i found that if i change createPersistentCookie to false they can log normally.

There is anyone to help me with some ideias why this is occurring ?

Thanks everyone and sorry my 开发者_如何学编程english !!

ThreadAbortException is thrown in order to stop the execution of a thread. It's not an error in itself. When a redirect is done immediately (without completing the request) a ThreadAbortException is thrown to accomplish this.