Hi,
I was investigating yous navbar template and output results.
1st - you have huge changes in navbar template according to default one. It doesn't have be the reason, but you can check does dropdown will fir in your changes template, by setting it in custom place.
2nd - in your output you have totally broken this part (starting from <tr> and ending at </tr>):
HTML Code:
</div> </EdNoIndex> <tr><td><center><a onclick="pageTracker._trackPageview ('/outgoing/http_www_addthis_com_bookmark_php_v_250_amp_pub_reddeforos');" rel="nofollow" class="addthis_button" href="http://www.addthis.com/bookmark.php?v=250&pub=reddeforos"><img src="http://s7.addthis.com/static/btn/v2/**-share-es.gif" width="125" height="16" alt="Bookmark and Share" style="border:0"/></a><script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js?pub=reddeforos"></script> <br /> Realizando modificaciones, disculpen la visualización incorrecta</td></tr> <div class="vbmenu_popup" id="vbettranslations_menu" style="display:none;margin-top:3px" align="left">
It is broken because it defines table row which is not inside of a table (just between 2 divs). Some mod is adding this to yor navbar (it is not included there). Please make corrections. It can cause the issue.