I've been getting reports of this issue lately. The easy solution is to just delete all backcountrypilot.org cookies and re-login. Just now I deleted all sessions on the server, so people may have to log back in anyway.
People with this problem likely can't view the forum, so I've updated the Help page: http://www.backcountrypilot.org/help
Explanation:
Viewing the forum does not require one to be logged in, but if the server detects a BCP cookie, it tries to process it to recover your session (automatically log you in.) It will redirect you to the login page if it can;t process the cookie, but once back on the login page, it sees that cookie again thinking it's valid and redirects you again and... infinite loop. Most browsers catch this so they don't crash.
