Thanks Andrew.
I just read your message after having spent another 2 hours reading exactly this document and having done everything again and again.
Of course the mistake must be on my side, but I am totally puzzled how the connection worked until I stopped all trades shortly only to reconnect to the same (but in leverage changed) account.
They even did reset the password on their end and confirmed that I am logged into the demo account all day.
Right now I am considering to uninstall Zorro totally and start everything from scratch again.

You did your best and I know that there is nothing you could help me with.
I am very grateful for all the help you are given and in case someone from the Zorro-team reads this I want to tell them that I think that you should get some Zorro-S benefits for all your valuable help (which I am certain that you also give to many others). In my eyes you and jcl ("the Zorro-boss") are the top ones here.