CSS filters - sometimes work, sometimes not?

Question

I am on the verge of hair extension because of this.

Here I have a block of perfectly functioning CSS:

#admin .block.mode.off
{
    opacity: 0.25;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(opacity=25)";
    filter: progid:DXImageTransform.Microsoft.Alpha(opacity=25);
}

Meanwhile ... Internet Explorer 8 couldn't take care of my filter ads here:

#admin .drop .tabs
{
    margin-bottom: 12px;
}
#admin .drop .tab
{
    margin-right: 4px;
}
#admin .drop .tab.off
{
    cursor: pointer;
    opacity: 0.5;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(opacity=50)";
    filter: progid:DXImageTransform.Microsoft.Alpha(opacity=50);
}
#admin .drop .tab.off:hover
{
    text-shadow: 0px 0px 4px #fff;
}
#admin .drop .tab.on
{
    cursor: default;
    text-shadow: 0px 0px 4px #fff;
    -ms-filter: "progid:DXImageTransform.Microsoft.Glow(color=#fff, strength=4)";
    filter: progid:DXImageTransform.Microsoft.Glow(color=#fff, strength=4);
}

My document is displayed in IE8 standards, and I assume that the developer tools is tuna loading, because the function block is displayed on the CSS tab as:

filter: progid:DXImageTransform.Microsoft.Alpha(opacity=25); opacity: 0.25

Does anyone have any ideas?

Answer 1

#admin .drop .tab hasLayout. zoom:1 , : IE8 hasLayout , height:1% ( , ).