At the end of Drag & Drop from Tree to the drop panel, the dragged item visually 'stuck', IE reporting an JS error:
Message: Invalid argument.
and there is no dropListener method invoked.
In the attachment maven project to outline the problem, just make sure cleare the cache of Internet Explored before loading the page.
It works if you change RichFaces version to 4.1.0.Final in pom.xml, so it looks like regression. I will create bug report.
there is no activity (not here and not at the bug page), so it can be one of two - it's obvious what's going on or there is not enough data.
RichFaces Team, do you need any other info?