use latest SU version 2015 (profile shows 2014) do install and first launch with admin rights e.g. by "Right Clicking > Run as Admin..." disable all plugins at "Window > Preferences > Extensions" or by moving away from the SU plugin directory especially if using older ones and activate one by one for finding the culprit disable "Window > Preferences > OpenGL > Use Hardware Acceleration" if using an incompatible/lame video card as e.g. intel GMA/HD/Iris hth