Aparantly running GTK2 and GTK3 applications side by side gives problems too. The script /etc/X11/Xsession.d/80appmenu is now checking if the file /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so exists and then puts the environment variable in place. This crashes GTK3 applications.
Aparantly running GTK2 and GTK3 applications side by side gives problems too. The script /etc/X11/ Xsession. d/80appmenu is now checking if the file /usr/lib/ gtk-2.0/ 2.10.0/ menuproxies/ libappmenu. so exists and then puts the environment variable in place. This crashes GTK3 applications.