Hello,
I’m sorry that you’re running into this issue, but I’ll be happy to help you figure out what’s going on. I took a look at one of the events on your site and was able to make it to the checkout page before being prompted to login to complete the transaction. Can you please send me a link to an event this is happening with, along with a screenshot of the error you are receiving?
Is this happening only with tickets, or with other types of products as well?
If you haven’t done so already, please make sure to run through these steps to check for a conflict with your theme and other plugins. You’ll want to have WP_DEBUG enabled while testing – please be sure to copy/paste any errors you come across into your reply. If you don’t want to do this on your live site, the free WP Staging plugin will let you create a quick copy of your live site that you can use for testing.
Thanks,
Jennifer