Hello Alex,
Thank you for your answer.
I was trying to answer you when I realised that I'm using a wrong Dropbox account.
It is actually more subtle than that : I have a Gmail account which looks like that :
firstname.lastname@gmail.com.
I don't know if you know that, but Gmail automaticaly creates synonyms for your email.
In my case, for example, I can use
firstnamelastname@gmail.com,
firstname_lastname@gmail.com, etc.
From the beginning I took the habit to use
firstnamelastname@gmail.com when I register on a website. And I have done so for Dropbox.
I also created another Dropbox account with
firstname.lastname@gmail.com.
Now the problem : when I use the "login with Google" option, CC logs me to the last (firstname.lastname) instead of the first (firstnamelastname)...
I don't see any solution to my problem as long as the Dropbox login has not been fixed on CC...
Emphyrio