Tienda/PayPal payment processing issues

Hi,

We're using Joomdle 0.9 and Tienda on our Joomla 1.5.x site. Some of the orders are being processed without any problems. Some of the orders are being set to "pre-payment" instead of completed. When this happens, the user's Moodle account is created, user has access to the courses, but the user is not actually enrolled. It's happening fairly regularly, but not each time. Has anyone seen this behavior before? I'm not even sure where to look to resolve this issue. Thanks in advance for any direction.

Sherri

If the order is kept in "pre-payment" state, Joomdle integration will not kick in. It only acts when order is completed.

If the order is really being completed, and the status is not set accordingly, the problem mustr be with Tienda and/or Paypal, but not Joomdle.