amdgpu_Pro - kubuntu 16.04.2 plasma shell crash at logout

[Peter Mc Donough]

Hi,

I've installed Kubuntu 16.04.2 plus the amdgpu-pro driver 17.10 from the 
AMD-Page. System: AMD-processor, 64bit, 16GB RAM; AMD Phenom(tm) II X4 
960T Processor; AMD Radeon (TM) RX 460 Graphics

Everything seems to run fine, except when I log out, the screen turns 
black, shows an error message and returns after a short while to the 
login mask. No other problems, so far.
I cant't recall having a crash before I added the amdgpu-pro-driver, 
i.e. at installation of Kubuntu.

Here is one oft the messages (they seem to be different all the time) 
ocasionally the krunner is mentioned.

Application: ksmserver (ksmserver), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  0x00007f33a74eb1fe in AGER_ClearEntries () from 
/opt/amdgpu-pro/lib/x86_64-linux-gnu/libGL.so.1
#7  0x00007f33a74eb6bf in AGER_Die () from 
/opt/amdgpu-pro/lib/x86_64-linux-gnu/libGL.so.1
#8  0x00007f33a74b812f in ?? () from 
/opt/amdgpu-pro/lib/x86_64-linux-gnu/libGL.so.1
#9  0x00007f33b28e0000 in ?? ()
#10 0x00007f33ae4df078 in ?? () from 
/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007ffdd75c1ed0 in ?? ()
#12 0x00007f33a74f6561 in _fini () from 
/opt/amdgpu-pro/lib/x86_64-linux-gnu/libGL.so.1
#13 0x00007ffdd75c1ed0 in ?? ()
#14 0x00007f33b2893c35 in _dl_fini () at dl-fini.c:240
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Any ideas?

cu
Peter