There's also a slight possibility that the removal of libnxau in Arctica's nx-libs version (with some code moves to libNX11) causes problems, but we haven't seen a problem like this in other (though mostly Debian-based) setups yet.
Would any logs show this problem? How can we eliminate this issue being a cause?
The working server machine is able to run 3.5.99.7 from the copr repo
correctly, right?
And just to confirm permissions on the .Xauthority file: ls -l .X*
How do I know if it's really "working"? We have this: rpm -q nx-libs nx-libs-3.5.99.7-1.20170506git150cbc2.fc26.x86_64
I didn't provide everything from the journal logs as it was very long but you got what you needed? Any other commands to try? Re-install? Kernel is 4.12.13-300.fc26.x86_64 if that helps to know.