ok, in ubbthreads.tmpl I only had to find the first instance of this,
<!-- <? //UBBTREMARK -->
// File Version 6.5
<!-- echo <<<UBBTPRINT -->
$only_favs
$tbopen
<!-- UBBTPRINT; -->
<!-- for($c=0;$c<$catsize;$c++) { //UBBTREMARK -->
<!-- echo <<<UBBTPRINT -->
<!-- CATEGORY LOOP START -->
<tr>
$tbopen
And change to this,
<!-- <? //UBBTREMARK -->
// File Version 6.5
<!-- echo <<<UBBTPRINT -->
$only_favs
$tbopen
<!-- UBBTPRINT; -->
<!-- for($c=0;$c<$catsize;$c++) { //UBBTREMARK -->
<!-- echo <<<UBBTPRINT -->
<!-- CATEGORY LOOP START -->
<tr>
<!-- Add spacing between main forums -->
$tbclose
<br />
$tbopen
<!-- End spaceing code in forums -->
works for me