When the credit card information is entered and submitted (Pay Now) selected, the page tries to send information. The screen shows "Waiting for appcenter.intuit.com" at the bottom of the page, and then there is an error message "Were sorry, we are experiencing some problems. Please try again later", this error is from the appcenter page. The URL of the error is below.
I still have a test event up on the site if you want to look at it yourself. It's a bargin at $1.00