hi gosha, A common reason that can happen is that when you switch over to the new login, the DISPLAY environment variable is not set. Graphics app's need that variable to know what X display to connect to. So the fix would be simple, just set the variable with something like (for sh-type shells)
$ export DISPLAY=:0.0
or whatever the appropriate DISPLAY was before you switched users. Note: some ways of logging in will automatically set DISPLAY for you and the problem won't happen.
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