Hi Stefan!
You are not bothering me, you are helping me find bugs in alpha software. Thanks!
That said, I really hate broken html. It's like looking for a needle in a haystack. One important question: Did you get this problem when viewing the member list before editing any of the files? The thing is, trying to reproduce this error, for me GroupJive works flawlessly with some templates and is a mess with others. However, I only get the messy layout when looking at a topic in the forum, which would indicate that one of the switches I added to Joomlaboard is placed wrong. The problem does not lie in groupjive_func.inc, as I have tried removing all the HTML from that file and the problem remains.
I will keep looking, but please tell me if the member list viewing problem was there from the start.