[Hippy]

I bet you have Arcade: Main Nav Tab + Sub Menu + Dropdown Menu install

if so

go into plugin & products click plugin manager then open Navbar Arcade Tab
replace the code with this below


I remember fixing this way back I also posted to that thread..
guess it wasn't fixed

$tabselected = '';
$tablinks = '';
if (THIS_SCRIPT == 'arcade')
{
    $vbulletin->options['selectednavtab']='arcade';
    $tabselected = ' class="selected"';
    $tablinks = '                <ul class="floatcontainer">
                        <li><a href="arcade.php?&act=Arcade&module=league">Leaderboard</a></li>
<li><a href="arcade.php?&do=viewtournaments">Tournament</a></li>
 
<li><a href="arcade.php?&act=Arcade&do=createtourney">Create New Tournament</a></li>';
if (!is_member_of($vbulletin->userinfo, 1))
{
    $tablinks .= '<li class="popupmenu">
               <a href="javascript://" class="popupctrl">Misc. Menu</a>
               <ul class="popupbody popuphover"> 
<li><a href="arcade.php?&act=Arcade&module=settings">Settings</a></li>
<li><a href="arcade.php?&act=Arcade&module=favorites">Favorites</a></li>
<li><a href="arcade.php?&act=Arcade&module=report">Rankings</a></li> 
                                </ul></li>';
}     
    $tablinks .= '<li class="popupmenu">
               <a href="javascript://" class="popupctrl">Categories Menu</a>
               <ul class="popupbody popuphover">
<li><a href="arcade.php?&act=Arcade&cat=17">Memory</a></li>
<li><a href="arcade.php?&act=Arcade&cat=8">Casino</a></li>
<li><a href="arcade.php?&act=Arcade&cat=5">Sports</a></li>
<li><a href="arcade.php?&act=Arcade&cat=6">Shooters</a></li>
<li><a href="arcade.php?&act=Arcade&cat=2">Puzzles</a></li>
<li><a href="arcade.php?&act=Arcade&cat=15">Adults</a></li>
<li><a href="arcade.php?&act=Arcade&cat=7">PinBall</a></li>
<li><a href="arcade.php?&act=Arcade&cat=18">Slots</a></li>
<li><a href="arcade.php?&act=Arcade&cat=8">Cards</a></li>
<li><a href="arcade.php?&act=Arcade&cat=19">Tiles</a></li>
<li><a href="arcade.php?&act=Arcade&cat=4">Retro</a></li>
<li><a href="arcade.php?&act=Arcade&cat=1">New Additions</a></li> 
 
                                </ul>
                            </li>
 
                </ul> ';
 
 
} 
$template_hook['navtab_end'] .= '<li'.$tabselected.'><a class="navtab" href="arcade.php">Arcade</a>'.$tablinks.'</li>' ;

Just looked at the original code and there is a extra / in there this above will fix you up..

be sure next time to post in the correct thread thanks