Internet Explorer - don't stay logged into a forum

Hi all

This isue happens on my work PC using IE9 and my home PC using IE10.

There is one forum I visit often.
It used to remember my login but no longer does.

If I login, close IE, open IE and go back to the forum, I have to login again.
I'm convinced its because of a Windows update but can't quite prove it yet.

Everyone else on the forum has confirmed the same problem.

I've gone through all the IE options of remembering your password etc but nothing works.
It does remember my details when I type the first letter of my nick - I just select the nick and my remembered password gets filled in.

Its just weird that I never had to login for ages in the past after checking the "Log me on automatically each visit" box.
Just doesnt work?!

Any ideas?
Thanks!