There was a bug uncovered in the new custom booking forms where guests could not book anonymously. This only occurs if you upgraded and did not modify the booking form.
The way to fix it is pretty simple. Go to Events > Booking Form Editor, and in the email field make sure you rest the field type to E-mail again. If you’ve tried modifying your booking form already, you would have had to choose the email field as it’s the only mandatory field. To double-check, make sure your Email field has a type of “E-mail (required)“.
This update also resolves this issue and will automatically correct the situation, as well as correcting the initial installation bug.
Aside from this, we’ve also added a trim function so that users that added an extra space to the start/end of member update keys don’t run into issues.