changing user with SU, gives "Xlib: connection to ":0.0" refused by server"

I did :

        #su OTHERUSER
and :

        OTHERUSER@PC:~$ gedit
just to get:

	Xlib: connection to ":0.0" refused by server
	Xlib: No protocol specified

Any ideas?

I have a similar prob with

        #sudo -u OTHERUSER APP

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