i'm not sure if this happened to others. but for me, when i hovered over my own username it said "unknown location", as shown in the attached image.
i added this at the top of member_ajax.php and it solved the problem:
PHP Code:
define('LOCATION_BYPASS', 1);
also, i dont understand why you use another css than vbulletin. that screwed up some colors on my board

i edited ajax-tooltip.css, deleted the whole 'demo' part and left only these:
PHP Code:
/* CSS needed for the script */
#ajax_tooltipObj{
z-index:1000000;
text-align:left;
}
#ajax_tooltipObj div{
position:relative;
}
/* If you don't want the arrow - Just set the width of this div to 1 or something like that and drop the background selectors from the CSS below */
#ajax_tooltipObj .ajax_tooltip_arrow{ /* Left div for the small arrow */
// background-image:url('../images/arrow.gif');
width:1px;
position:absolute;
left:0px;
top:0px;
background-repeat:no-repeat;
background-position:center left;
z-index:1000005;
height:60px;
}
#ajax_tooltipObj .ajax_tooltip_content{
border:1px solid #000000; /* Border width */
left:18px; /* Same as border thickness */
top:0px;
position:absolute;
width:150px; /* Width of tooltip content */
height:250px; /* Height of tooltip content */
background-color:#EBEBEB; /* Background color */
padding:5px; /* Space between border and content */
font-size:0.8em; /* Font size of content */
overflow:auto; /* Hide overflow content */
z-index:1000001;
}
and ajax-tooltip-demo.css is completely unneeded imho.
my guess is that you copied the demo parts of the css from the original ajax-tooltip plugin.
but you should remove them for the vbulletin plugin since vb has its own css