It's still not working unfortunately.
I went to the following page:
https://www.msgplus.net/SpecialPages/logon.aspx
and I clicked "Forgotten Password", typed my email address in and was sent a new password. But when I try to log in with it I get 'Your login attempt was not successful. Please try again.'
If I try the 'test' button in Messenger Plus!'s preferences->passwords->myplus! section, first try I get 'Invalid username/password' and from then on I get told that my account has been temporarily disabled.
Thanks in advance,
Ben