A couple of things.
You can delete the ini file and restart the program. It may help. I can’t remember what the name of the ini file is off the top of my head and I’m not in front of a workstation. Maybe another user can post the correct name before I get around to it.
The second thing that’s caused me issues in the past is the OpenGL setting. Run the OpenGL test in the preferences and then test with the software rendering to see if it helps at all.
The last thing would be to reinstall..