If you can't log in to Premium after the new update, it's one of two things:
1. You're simply entering the wrong password. Remember, your Premium password and forum password are not necessarily the same. You can try your password, and reset it if it's not working, from here: https://mblservices.org/
(alternatively I can reset it for you, PM me for that)
2. Your Premium password has a # or % - characters that are not supported and that we have written are not supported on the change password menu on mblservices.org (the only place where you can change your Premium password) for at least three years now. Change your password to something alphanumeric and it will work.
If you can't log in to your forum account after the new update you're entering the wrong password. Use forgot password or check in your browser's settings what your saved password is if it shows up as *****.