Problem with Authorize.net Checkouts

I'm having a problem in that when a customer checks out with Authorize.net, I only get a copy of the transaction processed from Authorize.net. I do not get a copy of the actual order nor does one show up on the Dashboard. So, I have received payment but since I don't get a copy of the order nor does one show up in the Dashboard, I have no idea what they have ordered and that info doesn't appear in the email Authorize.net sends out.

Please Help!

Thanks

see if the orders are in missing orders.

If so, check that you have IPN set up OR you have the right order status set for complete orders

The orders do not show in orders and the order status is set at Pending

check that your IPN is set up.

On the Sales > Orders page try selecting the 'missing orders' status to filter your results by.

Same problem. All my new orders end up in missing. I've tried replacing/modifying the authorizenet_aim.php file several times to no avail. Any ideas?
Thanks!