Registration Form does not display

My Joomla 3 site crashed on Saturday night and although I've managed to get everything back from an akeeba backup, the user registration form no longer displays. I have managed to update all of the community builder code to the latest  2.8.2 and made sure all of the plugins are up to date. I was using a copy of the template and that is shown as being in the plugins.
Is there a way of enabling debugging within communty builder so I can try and find out what's going on?
Thanks
Mark

Turn Joomla Debug on in Global Configuration, it applies to CB too.

Thanks Beat, That didn't get it showing but I did notice the following jquery errors when I inspect the page:

Please attach screenshots. We don't permit copy-paste data URI images here.

What do you mean your site crashed? Installed something and stopped working after installing that something? What was installed? Please be sure debug mode and maximum error reporting are both toggled on in Joomla global configuration then view your registration page to see if there's any PHP/API related errors. Your jQuery error was just a tooltip error and that won't cause an empty page.