hmmmm... I've noticed that you're having links to several (different) tables on the main screen. I don't know if the problem has something to do with this. The correct syntax for session links (you're using it now) is sid=xxxxxxxxxxxxxxxxxxxxxxxx&do=whatever&db=tablename -> it's working without any problem on my server (I'm using the newest DBMan with ONE table). In your original post, you said that you've just modified the templates; I assume the code of the Perl part of DBMan hasn't been modified. Have you ever tried to use the default templates that are coming with DBMan? Can you log off using them?

Keep me updated once you know more...

Good luck,
Oliver