Enable debug mode and maximum error reporting within Joomla global configuration (it's important for both to be set!). Once done try again and review any on-screen errors. If you're using a backend Joomla template, switch back to default. CB Auto Actions does nothing unless configured so only reason for this would be some sort of fatal error occurred in source.

You hit memory limits. You need to edit php.ini and increase the limit. Please contact your host as they often can do this for you. Your current limit looks like 32mb, I suggest increasing to 64mb.