I just fixed a similar problem with 2.0.2.1. It is not neccessary to force members to reset their passwords. Just log in to phpMyAdmin and then browse the jos_users table, any users that have migrated in the password column check the boxes by them and then delete those entires from jos_users. This will fix the problem, as the next time they log in it will put the correct data into the Joomla users table, including the passwords.
Wolfenrook
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