The strange thing here is that some users have had no problem, while others have. I have also in the current and past have had a certain fraction of users who seem to get stuck at some point of the registration, whether it the age verification, user agreement, or captcha. I can't help to think there is some strange configuration problem.
For my personal account I was able to get through the agreement fine, but for another test account it hung up. I looked at the DB records for the agreement and it was not inserting a value into the user_rules_accepted field.
