YAST crashing

I was having problems with a missing library, see this post :

I used Yast to find it, it looked like it was a possibility, but I decided to cancel/abort the installation.
I also exited YAST discarding changes.
Since then, EVERY time I use YAST, it lets me select packages, but, as soon as i hit ACCEPT, the
window disappears (crashes), no errors on screen, nothing, just disappears.
Rebooting doesn’t help.
Please help me to restore it.

Please post your repo list:

zypper lr -d

I’m only aware of such a crash in Factory’s YaST, which can be worked around by uninstalling libproxy1-config-kde4 (it is caused by a conflict between Qt4 and Qt5)

I re-installed everything, the machine was just set up, it wasn’t too painful.
I see how it goes.