yes, indeed.
I would not have thought that this could also be related to the graphics driver.
Oh man, no 3D with spice in the VMs and then this too.
It was the worst decision ever to replace my HD 5770 with a GTX 970.
Update:
Ok, forget the first point. My mistake.
I looked into the problem again.
I created a new user and thus an unbugged config and surprise surprise, the menu appears in the non-QT applications.