No movement on screen while navigating (W10)

I am using MN free (Windows version)
for many years now with great pleasure. But the recent update to
version 1.1.7.2 gives me a real headache.

For navigation I use an Win10 Acer
Aspire A515-52G laptop, Screenresolution: 2313 x 1301

• after starting the program: the
  screen stays black until I zoom in or out, (the zoombuttons don't function)

  
  

• in navigation mode the 3d screen
  is visible and I hear the instructions, but the screen does not
  change while driving. Touching the screen actuates the position for
  that moment.

  
  

So, the gps is recognised. What can be
the cause of this strange behaviour??