I'd check your template - I can't reproduce it on my site with either skin I have, and I don't have a test board running to really dig much further.
Mine looks like this, I can't assume yours does - but here is the snippet I have for those particular boxes:
Code:
<tr><td class="vbmenu_option"><a href="search.php?$session[sessionurl]do=getnew" accesskey="2">$vbphrase[new_posts_nav]:</a></td></tr>
<tr><td class="vbmenu_option"><a href="search.php?$session[sessionurl]do=getdaily" accesskey="2">$vbphrase[todays_posts]:</a></td></tr>
Possibly $bburl having a trailing slash? I don't know how your templates are coded...