Hi there. When you are in private messages, go to the bottom where it says Miscellaneous Settings and mark the box for saving your sent items. Then you can see what you sent. Also, a green arrow should show up when you respond to a pm. Hope this helps and there is not something else wrong.
I just saw your invite for your carnevil... it's great, but is that your real phone number/ address up there? Everybody, not just forum members, can see it, and I wasn't for sure if you minded that, so I thought I would ask.