The problem is with a dropdown menu, but will affect any absolutely positioned elements anchored inside the sections element.

This seems to be related to the fact that the element with "sections" class has hidden overflow or to be more exact it gets overflow:hidden as soon as the section is opened.

In the gadget I use I've prepared the following fix (I use it just after making my element visible):
if (typeof $j != 'undefined' && typeof $j.fn.wikiEditor != 'undefined')
{
var nbar = document.getElementById('wikiEditor-ui-toolbar');
var secs = getElementsByClassName(nbar, "div", "sections")[0];
secs.style.overflow = 'visible';
}

Still I'm not sure why is this overflow important at that level. It works fine in Firefox with visible overflow.

Version: unspecified
Severity: major
OS: Windows XP
Platform: PC