Hi djones51,
On my phone of all places, while running the Streamagic app, I found a system settings button and when I selected it I found the USB was set back to 1.0 and that is why my PC was not connecting. After changing it back to 2.0 and making the other changes as suggested in the link you sent me all is well! I have performed about three firmware updates since owning my 851N and never had a problem until now. In the future before I attempt any new firmware updates I'll proceed with caution and maybe wait a few days just in case people are reporting issues such as in the link. Thanks again!