You yould update the drivers of your graphics card.
Unless you have an old computer you should not have any issues using RoboDK. This issue can also happen if you are using RoboDK through a Remote Desktop session or a Virtual Machine.
I am also facing the issue this morning, was working fine yesterday. I'm getting an error message Unable to access file 'C:/Documents/RoboDk/Mecademic-Meca500-R3.robot' although the station I am trying to load is not using this robot