Unable to Create Access/Membership Levels

Following the advice to drop the wp_m* tables in my database I was able to reinstall Membership without also bringing along the unwanted settings. However when in the settings for Membership I try to create a new "free user" level nothing saves. It appears to me that the plugin is unable to create the required tables. I'm not much of a DB person, but I'm hoping there's a way to prompt the plugin to recreate the appropriate tables in my DB (if that's is indeed the problem) so that I can begin setting up membership and access levels without having to it manually.
Thanks.