Xlib Refuses Connection to Start RedCarpet

["Walter Barrett" <walterbarrett mail com>]

$red-carpet
(su password requested and entered)
Xlib: connection to ":0.0" refused by server
Xlib: Client is not authorized to connect to Server
Gtk-WARNING **: cannot open display: :0
$

I have the same problem with other applications.

Any suggestions? I deleted .XAuthority in ~/ and /root --- no change. thanks

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