Main Address investigation

[navtrello]

Some users reporting if they flash the image then load in their backed up wallet.dat file the "main address" is not correct. Investigate this reported bug, report what the cause is, implement a fix to be put in place before the next batch of NavPi ship.

[Dummann]

Maybe this is due to backing up the wallet, and afterwards encrypting it with a password? Encrypting the wallet generates a new address as far as I am aware.