This is possibly just an issue of patience...!
After reading through every response (and trying each proposed solution), the unit still didn't work. I figured I'd just let it be and see what happens. After about 10 minutes, the time displayed on the main unit (even those the program running on my computer shows no data at all). A few minutes after that, it displayed "today" in the upper left of the screen.
I noticed that the top of the screen shows "update 2/10" -- it's been running for at least 30 minutes now. I'll give it the benefit of the doubt and hope that it will run through all of the updates to completion. Will post back with a final review.