Reminder sent on every cron run

It's an upgrade from a previous Drupal 6 version, not certain when the upgrade was installed (assuming the same day the issue started happening). Using MySQL. I will go ahead and uninstall and do a fresh install to see where that gets me. Thanks.

I've uninstalled the module, deleted all files and re-uploaded beta2, the issue still occured. I then tried beta1 again, issue doesn't occur. Uninstalled beta1, deleted all files, tried beta2 again, reminder emails are still sent on every cron run.

I was going to try deleting the 'never accessed' accounts and move forward with beta2. However, I took a look at all of my users and they all now report they have accessed the site, I'm not sure how/when this happened, but I know there were a handful of accounts that used to be listed as 'never' under 'last access'. I can verify that two of them never accessed the site. Not sure where to go from here.

More digging... checked the logs, after each entry for "Reminder email sent to..." the following four errors are logged:

array_fill() [function.array-fill]: Number of elements must be positive in /home/.katch/adam640kb/drupal/includes/database.inc on line 235.

implode() [function.implode]: Bad arguments. in /home/.katch/adam640kb/drupal/includes/database.inc on line 235.

array_keys() [function.array-keys]: The first argument should be an array in /home/.katch/adam640kb/drupal/modules/user/user.module on line 500.

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 query: SELECT p.perm FROM default_role r INNER JOIN default_permission p ON p.rid = r.rid WHERE r.rid IN () in /home/.katch/adam640kb/drupal/modules/user/user.module on line 500.

Excellent, that appears to have fixed the issue for me. Thanks for the module and the help.