gnome-terminal fails to start

[thecolourblue@…]

Trying to run gnome-terminal fails with this error:

$ gnome-terminal 
Xlib:  extension "RANDR" missing on display "/tmp/launch-yGsTn9/:0".
Failed to contact the GConf daemon; exiting.

As far as I can tell dbus is running, but gconfd is not:

$ ps ax | grep dbus
51173   ??  Ss     0:00.01 /opt/local/bin/dbus-daemon --system --nofork
51242   ??  S      0:00.02 /opt/local/bin/dbus-daemon --nofork --session

The installed versions of the software are:

$ port installed gnome-terminal dbus gconf
The following ports are currently installed:
  dbus @1.2.12_5 (active)
  gconf @2.26.2_0 (active)
  gnome-terminal @2.26.1_0 (active)