The screen is “flashing” rapidly when I move the pointer over the model. Areas of the model disappear/shows. New HP computer with a dedicated 8Gb memory graphic card (Sketchup 2015 Pro). Ideas how to solve the problem is appreciated. Approx 10 ms between the pictures. Does not show in all other programs I use.
150516 Problem solved! It was an external screen problem.
Agree with @Cotty. This certainly seems like an OpenGL settings/driver/hardware issue. Unless other programs use the same OpenGL features as SketchUp, they won’t trigger whatever problem is happening.