Hey Ken,
Sorry to see you’re having troubles. Can you possibly send over your System Information as a private reply? Also, is there any way you can review our Testing for conflicts guide and run through the process of purchasing a ticket just to make sure there aren’t any theme and/or plugin conflicts?
When testing, please make sure WP_DEBUG and WP_DEBUG_LOG are enabled on your site’s wp-config.php file. Any errors will display at the top of your page as you try to reproduce the conflict. I also recommend right-clicking your mouse and opening the ‘Inspect’ tool to see if any errors display in the console. Note what you find and please include it in your reply.
Lastly, you say, “tickets/attendees have gone missing” – can you please elaborate exactly what is missing? If possible, include exact step-by-step instructions on how to reproduce the issue. The more detail you can provide, the better. This includes screenshots and screencasts.
Thanks and have a good rest of your day!