[SOLVED] How do I run script to activate auto-actions?

Ok, I've tried activating the URL for performing the Internal Users Auto-Action.
If I enter the URL in a browser I get a white page (even with max error reporting), and as far as I can tell, nothing is done for the user I've activated for testing.

You'll always get a whitepage. It has no output. It's just an endpoint for CRON/AJAX primarily. If the action does output something it'll output if format parameter isn't set to raw in the URL.

Enable debug mode and maximum error reporting in Joomla global configuration. Next edit your action and under Parameters enable debug. Now navigate to the internal users URL with &format=raw removed from the URL. This will allow debug output to display and CB Auto Actions will tell you if access or conditionals failed. Note your actions must have the "Internal Users" trigger or they will not fire for that URL.

Ok, excellent, I'll try that

Ok, if I changed the ACL to Everybody (as you adviced in the other thread), the rules are fired as they should be, and it works perfectly.