Is there any Progress in fixing this issue? I experience the same: while on APU Power doing flight preperation, the APU shuts down and the aircraft is not usable anymore. Even after connecting ground power, the battery continues to drain.

I don't know whats going on with you guys at CS, but your 1.x versions of your 737 and 777 releases are full of bugs and incomplete. You promise working systems on the product page, people pay money for things that are not included. I understand programming is hard, but this plane has been out for almost 2 years now with the same problem. This way of cheating customers is considered a crime in most parts of the world!