That certainly seems relevant to me. If you install the missing package, gnome-themes-standard, does the problem go away?
- Bug#863398: [gimp] menu bar not visibile Carsten Knoll
- Bug#863398: [gimp] menu bar not visibile Ari Pollak
- Bug#863398: [gimp] menu bar not visibile Carsten Knoll
- Bug#863398: [gimp] menu bar not visibile Ari Pollak
- Bug#863398: [gimp] menu bar not visibile Carsten Knoll