Thanks, I'll try that out. I'm sure that I remember that previously the payment step wasn't included if they were going to the waiting list.
This will be an issue for event that fills quickly, where we will have to manually disable the credit card option when the event is full, and add a "pay at the door, if I am offered a place" option, because at present, if it happened on a weekend we could have a large number of people who are being added to a waiting list AND paying with their credit card as part of the process.
I have updated to 4.2.7, and I still can't add people to the waiting list in the back end.