This morning I released a minor update to wp-SwimTeam. Unless you are running under WordPress multi-site, you will not see a difference. Under Multi-Site there was a bug in the database query that pulls the list of users from the WordPress database. Because not all users stored in the user table should be visible to a particular site, the list of users needs to be filtered and limited to just those who have access to the site. It was this filter portion of the query which was wrong.
You can find the update on your Dashboard or in the WordPress plugin repository.