Hi Lowell,
I recommend to uninstall PTE AV Studio, download the latest version 10.0.7: https://www.wnsoft.com/en/pte-av-studio/download/
and then install PTE AV Studio again. The program will be started with all Pro features.
Also I recommend to update drivers for your graphics card, check Windows Update centre, or update drivers manually.
If it doesn't help, browse the main menu > Settings > Preferences. Select System tab. And tick the option "Alternate renderer...". Click OK button and restart PTE AV Studio. It may help.