I can confirm this behavior. I'm using Ubuntu Mate 18.04 and some Gnome
utilities like gnome-calendar or gnome-weather. In gnome-calendar I
wanted to add a Google account, but there's no way do do it, because it
opens the gnome-control-center and shows a blank window.
** Attachment added: "Blank window of gnome-control-center"
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gnome-control-center is unusable on xubuntu-desktop, but called from
Gear (About this Computer, System Settings) icon, Text Entry Settings,
clock (Time & Date Settings)
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