Disk Director 12 - Recover never completes

I have a 2TB disk which I am trying to recover deleted volumes from. Using the Recover tools, it doesn't find any volumes on the initial pass and recommends to continue with a full scan. The utility has been running for 5 days and has found volumes but seems to have stalled. The Next button is disabled but there have not been any new volumes found in a few days. I downloaded the latest updates to DD12 before starting the recover process. See screenshot that has not changed in a 2 days.