Ok the first problem i think is you've added a column to main table but you haven't made it match up... just move your variable into the next table down (if there is a table - that is)
The next problem is that you have edited something in your 'forumhome_loggedinuser' template wrongly...
Revert it or look at this (cuz this is how it should look):
PHP Code:
<a href="member.php?s=$session[sessionhash]&action=getinfo&userid=$userid">$username</a>$invisibleuser
Regards
- miSt