This problem has been happening to many of us, including me yesterday (10 days after you). Obviously this issue hasn't been fixed. It may have cost me my account, because I got rid of the old keys once I generated a new one (after confirming the old one didn't work to log in). Now I've been manually granted an account, but I have no idea what the key for it is, because of this glitch.
RE: DTube 0.9: Doubling up your rewards