Windows Messenger unable to auto-login

Hi,

For some unknown reason Windows Messenger (4.7) won't
auto-login when it loads at startup. I see the hour
glass appear for a few seconds and then the 'x' appears
by the icon on the task bar.

I'm able to login if I click "Click here to sign in", so
I assume it's has saved my password. Now I have to
manual sign in.

It was fine a couple of weeks ago. Any idea what's wrong?

Thanks!

Kat