If I su to root and try to run nedit I get an error
root@---------# nedit
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
NEdit: Can't open display

But, if I first run
xhost +localhost
and then go to root and run nedit I'm OK.

In Debian there is some obscure simlink you can make that will solve this...
but I forget what it is. Is there a similar fix for Slack?

Thanks,
Al