You can try upgrading to version 3.07 which is the latest CBB version and see if it helps
Graphic Worx : Xoops Themes
Nothing against SmartFaq but I have yet to get it to cooperate with 2.0.15.
<link rel="stylesheet" type="text/css" media="screen" href="" />
<link rel="stylesheet" type="text/css" media="screen" href="<{$xoops_themecss}>" />