er not really. i have not had this problem recently but have in the past. it fixed itself when i cleared my temporary internet files which deletes the passwords and login details in your memory (along with internet history etc...) when i logged on for the first time after doing this i checked the box and it has been fine ever since.
to do this click "start" , right click on the internet button, click internet properties, click delete browsing history, click delete all and check the off-line box.
this will totally clear all internet related memory. all web addresses will be deleted from your browser address window, all cookies will be deleted and usernames and passwords.
you will retain your favourites though.
it's worth doing this every month or so as it does clog up your system some what.
on the other hand someone with more experience may well step in with another suggestion.
its a known problem with Internet Explorer when working with sessions, it sometimes gets mildly confused.. unfortunately, nothing we can do this end as its a fault with the browser.. microsoft know about it, but as usual, are ignoring it.