Comment # 3 on bug 1022727 from Rainer Krienke

I just tried:

- opened remote login via ssh -X -Y on SLES12SP2 host
- started qtconfig on the remote side. Works.
- started xterm on the remote side. Works.
- started yast2. Nothing happens, no window.....Crtl-C.
- started gnome-terminal on my local system. OK. Terminated gnome-terminal.
- started yast2 on the remote side. Works.

Yes this is weird, but its true. 
Rainer