There are usually 2 main reason why an absolute element won't show in IE.
The first is if the html for the absolute element is in the middle of html that is statically placed as IE doesn't like this. It likes the html for the absolute element to be placed at the end of the current stacking context and then it will magically display ok.
The second issue occurs when an absolute element follows floated elements and this can cause the absolute element to disappear. The solution in this case is simply to add clear:both to the absolute element (utter nonsense that it is).
In your page it seems its the second issue that is causing the problem and just adding this css should cure it.
margin: 30px 0;