Hi Brian,
Thanks for pointing out maintenance mode – that must have flicked back on when I disabled and re-initiated the other plugins (we have a maintenance mode plugin) when testing for The Event Calendar.
You should be able to access the site now.
I checked the plugin dates, and Pro was not up-to-date – it was still at version 3.8. Have updated and all is working well! Do you know why the plugin wasn’t giving notification to WordPress to update?
Thanks for your advice,
Damien