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The reason that I am suggesting that you do not become root is that when you use su (or similar) to become root much of your environment (particularly the DISPLAY variable which tells programs where to find Xwindows) is lost and could be what is causing your error below.
actually, the loss of DISPLAY isn't the problem, the loss of ~/.Xauthority is the problem :) (~ == /root not /home/mattb anymore) - -- He who is known as an early riser need not get up until noon. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) Comment: Only when you are sure they have you, can you stop being paranoid iD8DBQE/LgpYcAgRpy8z8UQRApUFAKCM45fRlQTcdCMIwVD9TdSxfE+iRQCfQDMm 82EAGjX8OslUfE/Z//f1gNA= =YG/1 -----END PGP SIGNATURE-----