The WP-Members User List has received an update today. This is version 2.1.1.
This version is a bug fix from the 2.1.0 release. It changes some of the comparison operators used for checking various settings and options and corrects problems introduced in 2.1.0. Specifically, this addresses the fact that the search form will not show even if turned on (because the logical comparison checking the setting is faulty in 2.1.0).