Do you have forum set to remember your name & password on the forum when you sign in? Did you originally sign up to forums from where you use LW? Are you using same browser as normal for entering this forum when LW program link brings you here?
Do you use PeerGuardian?
Have you checked your browser settings for keeping cookies for this site? This forum is cookies based.
I have a suspicion the problem is LW program based, but not certain. It may also be browser settings or personal security settings related. It certainly is an odd problem. I will investigate with others.