Created attachment 155154 [details] grey Menu Add Buttons (via "Formular-Steuerelemente"). After that all Menues are grey ! Funny ....
*** Bug 128254 has been marked as a duplicate of this bug. ***
You look to be on Windows with OpenGL rendering enabled, disable OpenGL (Tools -> Options -> View dialog) that will work around the visual glitch. *** This bug has been marked as a duplicate of bug 127910 ***