The proposed answer of setting the Editor CSS to static for the Portal works. If it's already set to Static (mine was), just Apply the change to force things through. I confirm it works for DNN 4.9.4 Community Edition.
Sounds like the skinning team is working on resolving this... http://www.dotnetnuke.com/Community/Forums/tabid/795/
forumid/109/threadid/282081/scope/posts/Default.aspx
They haven't apparently resolved it yet though... http://www.dotnetnuke.com/Community/Forums/tabid/795/
forumid/127/postid/310857/scope/posts/Default.aspx