Hi,
thanks for your reply. To answer your questions:
a) No, I did not change my account or user name on GC.
b) Yes, this description is correct. I used to tick the option "Do not share personal data with authorised developers." before.
Then, yesterday I authenticated in GC-Project an allowed GC to hand over user profile data to outside apps, such as GC-Project. Then, I received an error message, and I deleted the tick mark described above.
After this I could access to GC-Project, but nearly all menu options were greyed.
So I think user "Pleu" understood the problem correctly. The question is now, how to recover it.
Thanks for your kind support.
Regards
Guenther