Strange things happen since update to 5.1.8

Since I updated to the last version of KM (5.1.8), strange things happen. With all shapes, except squares and boxes, the selection box appears somewhere else on the screen, not corresponding to the shape I just designed. When I play the movie everything comes back to normal, but of course I can't design anything this way.
Is it happening to anybody else?
Thanx.

Try changing the OpenGL setting ( File > Preferences [ Drawing / Selection ] )

Thanx, quick and efficient solution. :thumbsup:
What about OpenGl, then?

Its a graphics library........ I think it is used on later versions to improve rendering.