Comment # 1 on bug 949978 from Wolfgang Bauer

(In reply to Rihards Olups from comment #0)
> in any case, it might be a good idea to upgrade to qt 5.5.0 for leap,
> possibly 5.5.1, if it comes out in time - if not, patches for those crashes
> would have to be backported...

Leap does already contain Qt 5.5.0, with some added patches:
* Tue Aug 18 2015 hrvoje.senjan@gmail.com
- Added patches from upstream:
  ignore-disabling-of-outputs-in-the-middle-of-the-mode-switch.patch
  (qtbug#44158, qtbug#46786, qtbug#46822)
  when-a-screen-comes-back-online-the-windows-need-to-be-told-about-it.patch
  (qtbug#47041)

Could you please try again with the 42.1-Current repo and see whether you still
have problems?

Changing the main repo URL to
http://download.opensuse.org/distribution/leap/42.1-Current/repo/oss/ and
running "zypper dup" should be enough, but you should stop AppArmor before the
upgrade ("rcapparmor stop") or the system will crash (known kernel problem,
already fixed).