Apparently I have invalid characters in my nickname - a name which only contains letters from the alphabet. Why am I being asked to change a name I've had for over a year of this forum?

Yes, it is unacceptable. Since the changes from old gamesas design, I can′t change my character name, because it say that my password isn′t correct. So I can′t change it since 2 years now.

1. So I login with my password, which I know.
2. I get a message: Your nickname contains invalid characters. Please, change it
3: I am going to change it and getting this since nearly 2 years now: Invalid password given (GS)