Konsole is started as normal user. In it is invoked the
midnight-commander. Keyboard-navigation and -keypresses are flawlessly
executed. The mouse-cursor moves if desired all over the screen.
Clicking *outside* the console starts the envisaged action on other
files, but *inside* the mc-konsole nothing happens at all when clicking.
gpm, konsole and mc all 3 are [ root:root 100755 ].
When I however start the console, then su to root and invoke mc
everything works properly! 
Where else should/could I look for the apparently missing
user-permissions? Thanks.