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Yes, the solution was simple:
Obviously I accidently logged in via Google (what I usually avoid), before I upgraded to "gold" - and forgot about it. 
Having 2 accounts and remebering only one of it was the death of access.
Now, with the right account, everything is fine - who would have thought it! 

When I tried to use the synchronization between app and PC browser, I needed to log-off and login in the Android app.
Now app and browser show me, there is no subscription any more.
Synchronization is refused with "SUBSCRIPTION_REQUIRED".
On the other hand the app still doesn't show advertisments.
When try (just for testing, don't need it double) to subscribe for "Gold" again via app, I get an error message from "Server DF-DFERH-01". Unknown problem cade 2, msg: dz, code: 11367

How can I get back my "gold" subscription?