Example image showing display issue
If you open SketchUp and you are having any kind of display issues, the first thing that you need to do is to check your preferences inside of SketchUp:
Open SketchUp > Click Window > Preferences > OpenGL and ensure that both boxes are ticked. You may also want to play with your anti-aliasing setting and also check your Graphics card.
9 times out of 10 - this will 100% fix your display issues! If not, please submit a support ticket via the Help Centre.