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I have a robust but older system. When I open any file, lines display everywhere all over my drawing (zingers). The problem first occurred when I was still using Windows 7 but has persisted into Windows 10. I completely uninstalled and reinstalled the program and upgraded to 32 GB of memory, but it didn't resolve the issue.
Open the Workspace Configuration dialog and create a new variable QV_D3DVERSION and set the new value to 9 or 11 and Save the change. Exit and re-enter the file and the display should be correct.