Issues with drop down menu only on IE9

Issues with drop down menu only on IE9

I've got a perfectly working css dropdown/popover menu which only has
issues in IE9. Issue with IE9 is that when I hover it fast enough menu
works and I have to be super precise.
Here is my css :
#meta_menu > ul > li > ul {
opacity: 0;
visibility: hidden;
padding: 5px 0px 0px 0px;
background-color: rgb(250,250,250);
text-align: left;
position: absolute;
top: 55px;
left: 50%;
margin-left: -90px;
margin-top: -40px;
width: 180px;
-webkit-transition: all .3s .1s;
-moz-transition: all .3s .1s;
-o-transition: all .3s .1s;
transition: all .3s .1s;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-webkit-box-shadow: 0 3px 10px rgba(0, 0, 0, 0.5);
-moz-box-shadow: 0 3px 10px rgba(0, 0, 0, 0.5);
box-shadow: 0 3px 10px rgba(0, 0, 0, 0.5);
z-index:5000;
}
#meta_menu > ul > li:hover > ul {
opacity: 1;
top: 65px;
visibility: visible;
}
#meta_menu > ul > li > ul:before{
content: '';
display: block;
border-color: rgba(255, 255, 255, 0) rgba(255, 255, 255, 0) #FAFAFA;
border-style: solid;
border-width: 10px;
position: absolute;
top: -20px;
left: 50%;
margin-left: -10px;
}
#meta_menu > ul ul > li {
position: relative;
margin:0px;
z-index: 1;
}
#meta_menu ul ul a{
color: rgb(50,50,50);
font-family: FuturaTT,Georgia,Palatino,Times New Roman,serif;
font-size: 13px;
background-color: rgb(250,250,250);
padding: 5px 8px 7px 16px;
display: block;
-webkit-transition: background-color .1s;
-moz-transition: background-color .1s;
-o-transition: background-color .1s;
transition: background-color .1s;
font-family: 'HelveticaNeue-Light','Helvetica Neue Light','Helvetica
Neue',Arial,Helvetica,sans-serif;
}
#meta_menu ul ul > li:hover > ul { opacity: 1; left: 196px; visibility:
visible;}
#meta_menu ul ul a{
background:none;
}
#meta_menu ul ul a:hover{
color:#888 !Important;
}
My HTML :
<div id="meta_menu">
<ul>
<li><a href="#">NOTIFICATIONS <span
class="notifications badge">0</span></a></li>
<li class="has-sub"><a href="#">RECENT PAGES</a>
<ul>
<li><a href='#'>Page 1</a></li>
<li><a href='#'>Page 2</a></li>
<li><a href='#'>Page 3</a></li>
<li><a href='#'>Page 4</a></li>
</ul>
</li>
<li class="meta_last"><a href="#" class="tips
sign_out">SIGN OUT</a></li>
</ul>
</div>
How does one troubleshoot these kind of issues with IE? Do you have
general guidelines you stick with IE? I've tried tried putting width 100 %
to the li element/tried setting display block/zoom 1 it worked for me in
some cases, not not though. Can anyone recommend where would I get
started?
Here is a fiddle code which replicates the issue :
http://jsfiddle.net/phKsk/2/