Trouble With Pinterest Again

Hi,

I’m having problems with authenticating my Pinterest account again.

I managed to get Google+ to work this time with a new password, but Pinterest that USED to have the same password keeps going back to my old password instead of the new one – and where it SAYS that the authentication has gone through, when it comes back to ask which board I wanted to post to, it’s quite obvious that the old password has been saved and the posts don’t get posted.

So – I deactivate the Pinterest account, then set up a new account with the new password. How do I stop it from choosing an old password in the ‘board choosing’ section? In fact, how do I stop it from choosing ANY password?