Created attachment 707092 [details]
yast log file

Opening a software related yast module (install software, manage repositories,
updates, etc) leads to a disappearing module window after progress bar for
repository updates has reached 100%. There is no crash window and no segfault
monitored by dmesg. The window just disappears. 

I'm using two displays in extended desktop mode (no clone). The described
behavior always occurs if the module window is located on my right, secondary
display. It seems that it doesn't happen on my primary monitor.

It also only affects software related modules. I tested it also with font and
printer module and everything works fine.

I attached y2log log file.