Using jQueryUI’s nested Sortables again I was surprised to see, that a rather stupid ie bug still exists for ie8+. In essence, dragging some nested Elements also starts dragging the parent Elements. In most cases this can be fixed quite easily unsing this piece of code from Stackoverflow.

http://stackoverflow.com/questions/1789169/jquery-unexpected-sortable-behaviour/1789775#1789775

Still i would suggest wrapping the code with if( $.browser.msie ) { } because the fix is not needed on other browsers. Mind you that $.browser is deprecated.