When we upgraded from 6.0 to 6.0.1 the onSelect callbacks for dropdown lists stopped working when using safari on an ipad.
Our .zul page is hooked into a java page that is a GenericForwardComposer

<window apply="com.dh.ui.ipad.view.video.DHzVideoHomeView" height="100%" width="100%">
.....

<listbox id="_screenList" mold="select" rows="1"/>

...

public class DHzVideoHomeView extends GenericForwardComposer
.....

public void onSelect$_screenList(Event event) throws Exception

{ _videoSwitcherControl.checkScreenSelection(); }

Our callback no longer gets called when we upgraded to 6.0.1 - rolling back to 6.0 and it works again.