This is caused by the bug in the server related to special characters. If you used in the password for example "&" you would have to replace it with "&" and then you will be able to login. For the moment I would recommend changing the password afterwards.
To whom it may concern,
I have just registered for an xmpp account, but am unable to log in.
usr: journalist@jabber.me
I created a 16-character password.
Client I am using is imo for iOS.
Any suggestions what might be wrong?
Regards,
Jimmy Wall.