Anyone currently running the beta of 6.1 will need to run the following sql commands in order for the mass mailer to work properly (If you used a different database prefix you will need to change w3t_Users to {yourprefix}Users, like betaUsers)
ALTER TABLE w3t_Users CHANGE U_EmailFormat U_EmailFormat VARCHAR(10) DEFAULT 'plaintext'
ALTER TABLE w3t_Users CHANGE U_AdminEmails U_AdminEmails VARCHAR(3) DEFAULT 'On'
UPDATE w3t_Users SET U_AdminEmails='On'
UPDATE w3t_Users SET U_EmailFormat='plaintext'
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Rick Baker
UBBThreads developer