Analysis fails with NullReferenceException


I don't get anything back after clicking to run the analysis, but I see this in the event viewer:
DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DnnSecurity.Passwords.PasswordValidator.GetPasswordStrength(Int32 IsSuperUser) at DnnSecurity.Checks.AuthenticationHost.Execute(PortalSettings portalSettings, IAsyncResult result) at DnnSecurity.DesktopModules.DnnSecurity.DnnSecurity.Button1_Click(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
I don't think I have anything obviously unusual with my configuration...