The passwords have all been changed when the site was being developed, they changed again when there was a massive glitch in the development. They are however now all working and the most likely reason that people are having problems is that they are either using an old password or are incorrectly entering the new one.
People make typos all the time, even when they are sure they are not, so here is what I suggest.
Click on the "forgot password" link under the login form. make sure that you have typed your email correctly.
When the email arrives Click on the link in the email, this will open the page to reset your password.
if you don't have a working link in the email very carefully copy the verification code, make sure you are not adding spaces on the end, paste that into the verification code box.
Open a notepad or word document on your computer and type your new password into the document. now copy that into the new password fields and confirm it.
Don't close the note pad yet, keep it open till you are ready to log in, now copy it again and paste it into the password box in the login box.
Please make sure you have tried all of these steps very carefully before you contact me which you can do by clicking here.
I always recommend a password manager like lastpass.