The code for UI Tabs was updated to allow new way of handling effects. The problem lies with the 'height' effect. The panel slides and closes properly but it does not slide back out. It just 'pops' back up. I have tried it by forcing it to slide out the new panel but it just doesn't work.

Just to be more elaborate:

$("#tabs ul").tabs({ fx: { height: 'toggle' } });

The code above should do slide up and down animations but in actual fact it just performs the slide up animation. It doesn't go through the slide down part.

Hope this is helpful.