I'm trying to get a background button to appear and sometimes it renders in IE8 and sometimes it doesn't. All I have to do is hit refresh and I've got a 50/50 chance of it working. Here are the two results when I hit refresh.

For what it's worth here is the code for the absent button
.disableDiv
{
position:relative;
font-size:10px;
text-align:center;
letter-spacing:1.4;
margin:2px 6px 5px 5px;
padding:1px;
width:80px;
z-index:1;
color:white;
font-weight:bold;
background-color:#F0BDBD;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
border-radius: 3px;
behavior: url('../styles/PIE.htc');
}

Also the button "Update" in the top right corner always renders correctly