Ok this only happens with 1 person. Whenever I try to text them from my phone, the app crashes. I can however send them messages just fine from my computer or iPad. I also don't think this person has blocked me as they have said they haven't and are obviously responding to my messages from my computer/iPad not to mention I see this person pretty frequently. I've tried to turn iMessage on and off and also reset my send/receive addresses/phone # as well. Any other ideas whats going on?