Never solved; so had to re-enter all data in a new tax return. Spent hours talking to TurboTax but never could connect with Technical/Software expert; three different reps at Turbotax could not find the contact, chat or phone number for technical help. Best help, albeit not technical expert, was from TurboTax Business rep.
After I looked at file info, it was apparent from small size - under 600 kB vs 4-6 MB - that there was virtually nothing left to recover.
