Cassie, I have Firefox but changed over to Internet Explorer 9 and encountered the exact same problem.
I, too, went into my history and clicked on a link to a discussion group on which I posted recently--so it took me back to where I was already logged in.
Ahhhh, great minds think alike. LOL
Age 68, 5 feet tall
Highest weight ever in the fall of 2010 246 lbs.
FitDay starting weight 1/17/2011 240 lbs.
Weight 6/25/2014 233 that obviously included a lot of water retention
Weight 7/13/2014 224.6 with an eye on "Onederland"