Master password is good, no others will work, SQL server problem

Hi Guys.I hope some kind person can help me. I have tried our max supplier but got nowhere and have trawled over a few forums and not seen any answers.We are running Max V10 entrepreneur
My problem is that I can login to any of our 3 databases using Master and Control and our other 3 users can do the same so that we are all logged on together.The problem is when any user tries to log on as themselves.
We get the following message:- see attachement and thanks

It basically seems that our passwords are not syncronised with the SQL database, I have been in and changed everyones passwords and get the message that they have been changed on all other address books but they still dont work.

Thanks for your kind help
paul