Draftsight 2018 SP1. I have Windows 10 professional with graphics card updated. I can not open a blank default .dwg or a .dwg drawing. The thumbnail view shows the drawing and the blank drawing but it will not allow me to view them on the screen. I can draw lines on the drawing, however, I can not see what I'm doing. I'm trying Draftsight professional to see if it works on this PC before I purchase it. Please let me know how to fix this. I have been through the forums and uninstalled and reinstalled a few times. I do not have a touchscreen and my graphics card is updated. Please let me know.