Sub-panel of the Panelbar doesn't expand properly with the animation set to false

[Joe]

After setting the animation to false, try to expand the panel contains some sub-panels and then collapse it and then expand it again, the sub-panels within this panel will not work properly. 

[Kamen Bundev]

Hello Joe,

The issue has already been fixed and the fix will be available with the next release (and the beta). Until then you can work around the issue by using animation with duration: 0, like this:
$("#panelbar").kendoPanelBar({
    animation: { expand: { duration: 0 }, collapse: { duration: 0 }}
});

Greetings,
Kamen Bundev
the Telerik team