Hi Andrea,
I ran into a similar permissions issue with Xephyr. Try adding these three
lines to /etc/dbus-1/system.d/xorg-server.conf (inside of the policy context
tags):
allow own=org.x.config.display2/
allow send_destination=org.x.config.display2/
I wanted to install and use Eclipse to develop for Maemo, so I
followed the directions to install ESbox using the links on
esbox.garage.maemo.org and get Eclipse Europa, PyDev and ESbox plugins
installed, and while they do appear to be installed successfully, I am
unable to select a SDK target.