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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 intoWindows 10. I completely uninstalled and reinstalled the program and upgraded to 32 GB of memory, but it didn't help.
Open Workspace Configuration and set the variable QV_D3DVERSION = 9 or QV_D3DVERSION = 11. Exit and re-enter the file and the display should now be corrected.