I still have the problem with or without the crystal. But as you say, - anything is worth trying.
But! - displaying nothing on one monitor, removes the effect. - Further evidence to the pattern emerging that points to using two screens!
However. Whilst displaying MA3 on only the Primary monitor, allows DA to work. - Conversely, displaying MA3 on the Secondary only, doesn't!
I would be interested to try Edgar's fix for the 'none refreshed' bug, to see what effect that might have. That bug is related to displaying on more than only the primary screen.
I have AVG anti-virus installed, and I regularly use
Advanced SystemCare 3 to combat spyware etc. - I used Malwarebytes when Highlander recommended it, so I will try that again and report back.