XDM authorization error

I'm getting the following error when I try to launch programs as a normal user: veronica@linux:~/thunderbird> ./thunderbird Xlib: connection to ":0.0" refused by server Xlib: XDM authorization key matches an existing client! (thunderbird-bin:4886): Gtk-WARNING **: cannot open display: This is my wife's account on the machine. I was setting up her environment and installing thunderbird and firefox. Neither would launch and running from the shell gave the above output. We belong to the same groups with the exception of wheel. I'm confused as to why she can't obtain XDM authorization. Any clues? Thanks. -- Trey Sizemore trey@fastmail.fm