jQuery-UI Opacity Effect on Tabs

Question

I'm having some issues using the opacity effect on jQuery-UI tabs... especially in IE

Here is my code;

$('#featured').tabs({
                     fx:{
                         opacity: "toggle"
                        }
                   }).tabs('rotate', 5000, true);

Check out http://www.jsfiddle.net/cxNj8/4/

Apart from the effect being ugly, it also does strange things in IE with the menu on the right once the rotation starts.

Does anyone know why this happens in IE?

Does anyone know a way to put a nicer fade effect in place like in jQuery cycle?