So, I just wanted to update this thread. After getting my replacement V2 this afternoon I opened it up to compare with the V2 that would not recognize the SD card, and my suspicion was correct. There was a missing component. In my case, labeled R65 on the board.
Measuring in-circuit resistance of the good cam was about 5K, so I tore through my box of junk (all good electronic techs have a box of junk) and found an old bluetooth earphone (remember when we thought people were talking to themselves, but realized they had one of them ear-things in?) and found a 5K resister (0603 package), and with much shaking of hands (I blame age and coffee), I finally got it placed, and the cam now recognized the SD card.
YMMV