Can't unlock screen after update from 42.2 to 42.3

When the lock screen is active I can’t unlock the lock screen by entering
the password. When I enter password the login screen goes away for a moment
and then pops up again. As workaround I need to do a root login in to a text
terminal an run “loginctl unlock-sessions”. Checking the syslog shows some
entries that might be related to the problem: like

2017-09-09T13:37:51.548596+02:00 linux-z0jl console-kit-daemon[3626]:
(process:5161): GLib-CRITICAL **: g_slice_set_config: assertion
'sys_page_size == 0' failed

However these entries aren’t in a 1.:1 relation to the unlock tries.
Xorg.log shows no problem.
I can’t be a wrong password, because this would be shown on the login screen
and logged into syslog.
This a Leap 42.3 installation with two special things:
Running a kernel from kernel stable ( problem showed up with 4.12.10 and
propriatary nvidia driver installed from .run file.

With 42.2 I’ve seen a similar problem from time to time when glx was broken because Xorg or mesa updates updates overwrote nvidias glx files. But now that happens also after a fresh reinstall of the nvidia driver, which used to fix the problem in 42.2.
Any ideas what is going wrong here are welcome.

How exactly did you perform the upgrade 42.2 => 42.3 ?
Do you see this issue with the stock kernel and the nvidia packages from the nvidia repo ??

I adapted all repos to the new version by editing the files in /etc/zypp/repos.d and then run zypper ref and zypper dup.
Haven’t tried the stock kernel and the nvidia repo. The running kernel version (4.12.10) and the nvidia driver (384.59) didn’t change during the update.
Meanwhile I updated kernel to 4.13.0 and nvidia to 384.69 using the same procedures which used to work always with 42.2.But that didn’t help.