Since I'm new to the forum, I wasn't sure where to open the topic, if it's the wrong section, I apologize in advance. I have been using the program for 2 years. I have not had a viewport problem in the program until today. When I changed my operating system and reinstalled the program today, I could not run the axonometric image on the right pocket. my current operating system is Windows 7.pc, the graphics and processor hardware is working smoothly. I request you to share with me if there are friends who have experienced this problem and found the solution.