If a menuitem has also a tooltip, then on mouseover the tooltip is displayed but the menuitem disappears.
The problem is reproduced with ZK 7.0.3.
This was not a problem in ZK 6.5.x.

A simple zul to check the problem ( zkfiddle doesn't work for me).
On mouseover over the "New" menuitem, it disappears.

<zk>
<menubar id="menubar" hflex="min">
<menu label="Project" image="/img/Centigrade-Widget-Icons/Briefcase-16x16.png">
<menupopup>
<menuitem image="/img/Centigrade-Widget-Icons/BriefcaseSpark-16x16.png" label="New"
onClick="alert(self.label)" tooltip="tooltip_pp" />
<menuitem image="/img/Centigrade-Widget-Icons/BriefcaseOpen-16x16.png" label="Open"
onClick="alert(self.label)" />
</menupopup>
</menu>
</menubar>
<popup id="tooltip_pp">
Some text
</popup>
</zk>