I use an Microsoft Surface Pro 3 (Intel graphics), which I updated from 42.2 to
42.3. This meant also an upgrade to xf86-input-libinput-0.25.1-1.1 (currently).

Using Gnome and IceWM, only GTK apps are starting. Other apps (i.e.: Qt-based,
Firefox, Chrome) simply crash at startup.

Reverting the single library given above to the version provided in 42.2
(currently xf86-input-libinput-0.19.1-1.1) solves the problem.

Example of the coredumps:
https://lists.opensuse.org/archive/opensuse-factory/2017-06/msg00430.html

More info on the hw:
https://lists.opensuse.org/archive/opensuse-factory/2017-06/msg00466.html

I tried 42.3 stock kernel and HEAD - no difference.
I removed the Xorg Intel driver in order to use generic modesetting - no
difference.