The username cannot be changed for the GPS-Sport.net website?!?!
Did you perhaps only change your password? Or Email? If you changed the email, you have to confirm the account again (a confirmation email has been sent to the new email address).
Please also check if the upload target is set correctly in the Run.GPS app / upload dialog.
Changed username/pw on website & android app. App keeps username, shows correct number of asterisks on User Config page, but get error uploading to gps-sport.net.
Going into User Config to "change" PW again, but doesn't appear to be storing new password based on number of asterisks in the popup window.