[nerbert]

That's not the thread preview, that's the title for the link for the last poster. The link is created way down deep in the PHP,I would think, and modifying it would probably require a direct hack. So to get rid of it you'll have to use JavaScript. I used the onload event for the little go to last post button to strip the title from the last poster link.

Near the bottom of the threadbit template find the link with the button image and modify as follows:

			<a href="{vb:link thread, {vb:raw thread}, {vb:raw pageinfo_lastpost}, 'threadid', 'threadtitle'}#post{vb:raw pageinfo_lastpost.p}" class="lastpostdate understate" title="{vb:rawphrase go_to_last_post}"><img src="{vb:stylevar imgdir_button}/lastpost-{vb:stylevar right}.png" alt="{vb:rawphrase go_to_last_post}" 
onload="this.parentNode.parentNode.parentNode.getElementsByTagName('a')[0].removeAttribute('title');" /></a>