I get the following error in the admin area when both Register Plus Redux 3.9.10 and NextGEN Gallery 2.0.7 are activated:
There is another active plugin that is conflicting with Register Plus Redux. The conflicting plugin is creating its own wp_new_user_notification function, this function is used to alter the messages sent out following the creation of a new user. Please refer to radiok.info for help resolving this issue.