Thank you for the reply.
I tried the method you described but it also didn't work.
Sincerely,
absolado
Edit: Fixed the issue
Maybe this is important to further issues regarding the registration process.
I think I found the issue.
I've reset my email in the account options and there I was able to receive a confirmation email where I can validate my account again (before I didn't received one). Yes, the email that I typed in before was exactly the same, there were no typos. Somehow I wasn't able to login with my email before, only my username was valid. Now both are valid.
Maybe this is something related to the validating process in the database...
Anyway, it's fixed now.
Sincerely,
absolado