With the newest release of this plugin new customers can no longer register via "My Account". So I deactivated the plugin and re-activated it as a test. Here is the error message I get upon re-activation:
Plugin could not be activated because it triggered a fatal error.
Fatal error: Maximum execution time of 30 seconds exceeded in /home/jetbeads/public_html/wp/wp-content/plugins/user-meta-manager/user-meta-manager.php on line 163