normal user cannot open display in window manager

[lukelukeluke]

Hi there,
im using suse linux 9.0 with the window manager "Window Maker".
the root user works very fine with it. I can do everything that needs X display support with root (play movies with maplayer, use yast2 config tool and so on).
The only problem is: A normal user cant open display. If i try to start yast2 under a normal user it says "cant open display".
Or if i play a movie with mplayer under a normal user, it only gives me the sound of the movie and not really the movie itself...

any ideas?

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