Found it after modifying the web search a little. I had to start openbox with:
/usr/bin/dbus-launch --exit-with-session openbox --startup $HOME/.config/openbox/autostart
The dbus-launch --exit-with-session apparently starts some service that gnome apps now insist on. This apparently works with other window managers: it was an i3 user who found it.
Found it after modifying the web search a little. I had to start openbox with:
/usr/bin/ dbus-launch --exit-with-session openbox --startup $HOME/. config/ openbox/ autostart
The dbus-launch --exit-with-session apparently starts some service that gnome apps now insist on. This apparently works with other window managers: it was an i3 user who found it.