nop, even if i deactivate the left and right columns in forum view i get the same layout problem. My forum width is 100% but if i change it to 90% or 800px the problem is still there.
It seems to me a missing <br>.
i also get this errors in the w3c validator
This page is not Valid XHTML 1.0 Transitional!
Below are the results of checking this document for XML well-formedness and validity.
1. Error Line 78 column 8: end tag for "br" omitted, but OMITTAG NO was specified.
You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".
2. Info Line 78 column 4: start tag was here.