Yes, sorry for not responding, I have migrated to a new OS (Win 10) where the problem no longer occurs. Closing it is a good solution for now.
My final progress in it was recorded in the last message on 11 March 2015. Thanks for the help!

Best,
Peeter

On Mon, Feb 29, 2016 at 7:49 AM, Lars Ingebrigtsen <larsi@gnus.org> wrote:
Lars Ingebrigtsen <larsi@gnus.org> writes:

>> In the Display Properties, select Settings, and click Advanced.  You
>> should be presented with the settings specific to your graphics
>> driver.  Usually somewhere on the Troubleshoot tab you should see a
>> way to control the hardware acceleration level; try to lower it.
>
> Peeter, did these things fix your problems?

More information was requested, but no response was given within a few
months, so I'm closing this bug report.  If the problem still exists,
please reopen this bug report.

--
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no