I am able to receive messages from everyone but one person. I can send them messages, and they receive them, but I cannot get they're response. I AM able to receive MMS from this person. This happened after I set up the BBM with this person. That is working fine, but the regular SMS is not. Thanks for the help!
Make sure that the Address Book contact is not linked into the BBM contact, i.e. you may be getting the SMS messages in BBM. My son had my old BB 8330 and I would get his SMS texts in BBM. Just a thought.