Because I still prefered my old openbox setup, I switched back from unity to openbox + tint2. But this gave me a few minor problems.

For one, software-center, was not working anymore.  I could browse applications, but clicking install did nothing.

This can be fixed by adding the following line to your ~/.config/openbox/autostart.sh:

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/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1

To get a working gnome-keyring again add the following line:

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eval $(shell gnome-keyring-daemon -s)

Now enjoy the comforts of some gnome tools in your clean an fast openbox!