Hello:
Thanks! Replacing the graphicSettings.lsx file solved my issue. Messing with the settings, I notice that if I set the resolution to a setting with specific refresh rates it causes the issue, so that appears to have been the problem. I will avoid those refresh rates. (And now I know that if I have a similar issue in the future I can reset the settings using the method you describe above).
Thanks again for the support with this issue.
