Mass Mailer not working properly in 4.10.0/4.10.1 - fix

[Paul]

In 4.10.0-4.10.1 the mass mailer plugin doesn't work properly. We'll be rolling out a fix, but you can apply a fix manually by doing the following:

Update plugins/mass_mailer/mass_mailer_controller.php line 23 add 
        $this->structure->setDefaultView(APPDIR);
Before 
        parent::preAction();