Our system processes every sale the instant PayPal sends us an IPN confirming completed payment.
Unfortunately, starting late yesterday afternoon, PayPal had some glitches in their IPN system causing a backlog of delayed IPNs they were working to catch up with until early this morning.
You can read more details about the issue, with tips for handling any glitched-up sales you might still have, in the most recent posts to our System Status & Updates forum here:
http://www.e-junkie.com/bb/forum/6