Stop rejecting "in-admissable" data in the Contact Profile of Autoresponders.
Someone can opt-in with a name like "Bob 4". But if I edit anything in their contact profile, and then try to save it, the name 'Bob 4' is rejected as having bad characters.
same thing for Zip code if the shopping cart expects 5. There are some other fields that it checks for admissable data.
The Shopping cart should not reject any data in the field. It should except whatever. Why can't someone have a number in their name?