Hi Corrina - as i said in my reply to wendy - i use firefox not internet explorer and have the login page as a tab on my browser so its simple to get to.
I've never had the problem you describe and just tried what you do and i get straight back in - even when i close the page and go to new page from google search not from saved tab. If you have to restart your pc I think it must be something to do with your pc settings- but I'm not very IT minded and wouldn't know where to start looking. I look through settings simply for anything that sounds logically wrong - its easy to have changed something without meaning to.

done it myself a few times..its a curious problem though and i'd be interested to find out why its happening