[Bug 83975] gthumb starts with an empty window on my system

[towolf]

Public bug reported:

Binary package hint: gthumb

After the last upstream version upping to 2.9.1 gthumb only shows an empty window after startup. After blindly hitting F for full-screen the image is displayed, also the GUI elements work in full-screen. I checked and gthumb works flawlessly in the Live-CD desktop.
What is there to my system that breaks gthumb? How can I figure out the cause for this?

** Affects: gthumb (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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gthumb starts with an empty window on my system
https://launchpad.net/bugs/83975