We have a number of portlets that employ overlays (absolute positioned divs which should float above the page) to display information. We've run into some issues when these portlets are used on pages that allow drag and drop. If a portlet window is dragged on the page, then the overlay is obscured by the window. This appears to be an issue with the Scriptaculous code and the fact that the window div is set to a relative position after the drop. If one reloads the page the problem disappears, until another window is moved.
Has anyone else experienced this and found a solution?