Thanks for doing that Mark. I also thought maybe my saved default flight was causing problems with this aircraft.

I have tried saving with the C172 running, as well as cold/dark in the following config:

C172
completely shut down
avionics on
magnetos - I tried "off" and "both"
alternator - tried off and on
brake set

And I tried deleting my default flight to see if that would help.

But I'm also having the 737 issues even if I load the CS cold/dark saved flight. Fortunately the infinite battery option in FSUIPC is an effective workaround even thought the "always_on" entry in the .cfg didn't help me.