After upgrading MacOS to Tahoe, Manish Soni (UNC) reported that VERDI display is covered by a black screen.
The workaround is to use the minimize button in the upper left corner to minimize the VERDI application, and then double-click on the XQuartz dock to show applications that have been docked.
Then hover and click on VERDI to activate the re-display of VERDI. After doing the re-display, VERDI works without having issues with black screens.
This issue is reported on the XQuartz github and also many other applications that require XQuartz to display.
SEATStandards/ncvis#23