I'd clear your cookies and cache (and history if you so choose) first, then check that you have the right version of the website bookmarked; if you are starting on the '
http://' version of the site instead of the '
https://' version of the site it would mess with your login when changing pages. Also, if you have the website bookmarked without the 'www' after the '
https://' it will also cause the same issues.
Your bookmark (or the home page you're starting on however you get there) should look like this: "
https://www.bladeforums.com"