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

[(=?utf-8?q?=60=60-=5F-=C2=B4=C2=B4?=) -- Fernando]

I did :
	#su OTHERUSER
and :
	OTHERUSER at 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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