Well, it only took 3 weeks but I finally got my replacement SD card and the nav system is working again. The parts guy and the service guy were blaming each other for the delay. Bottom line: they admitted it slipped through the cracks.
When I got home I popped the card out and took it inside to do a backup and update with the Subaru Toolbox software before anything else happened. The interesting thing was that when I put the card in my laptop, Windows said it contained bad clusters and offered to fix them. I declined. There must be something proprietary with the card.