All menu items greyed out/disabled

[fabtagon]

== Observed Behaviour ==

When starting Gimp, *all* menu items are greyed out. I can click 'File', but all menu entries (New, Create, Save, ...) are greyed out. Same for Edit, Select, ... Help.

If I invoke "gimp $filename" or drag'n'drop an image file on The Gimp, it will render the image, allow me to edit it, but still not enable File->Save etc. When Closing The Gimp, it will ask me whether I want to store it as .xfc somewhere.

== Expected Behaviour ==

Menu entries shouldn't be greyed out.

== Additional Info ==

I've recently upgraded to Bionic from previous LTS, but purging Gimp, deleting the user's config files and reinstalling Gimp doesn't resolve the problem.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gimp 2.8.22-1
ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18
Uname: Linux 4.15.0-32-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
Date: Mon Aug 27 18:41:46 2018
InstallationDate: Installed on 2015-04-27 (1217 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: gimp
UpgradeStatus: Upgraded to bionic on 2018-08-18 (8 days ago)

[fabtagon (fabtagon)]

Ouch! This just seems to be some (default) theme problem. Menu entries hard-to-read light-gray text on lighter-light-gray background, but they work! Please feel free to close this bug. Or should this be moved over to 'themes department' (which package would that be)?