It looks like the issue is not really the PopupPanel but rather the widget(s) you add inside: if you reuse the same widget (either in a single PopupPanel that you hide/show, or within several PopupPanel-s during the lifetime of the application), then handlers won't be unregistered for you, just like for any other widget (the same goes for the CloseHandler attached to a PopupPanel: PopupPanel is a widget like any other –except you don't add it to a parent widget–, so handlers aren't unregistered automatically). If on the other hand you re-create everything from scratch every time, then you'll obviously have to register your handlers on the new instances.
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