1. You should not have any stuck orders if you have IPN notifications working properly and PDT support enabled (only available in v1.3.7.1 or 1.3.7 with May 20 (or newer) patch).
2. You should *never* push an order through if it's not been paid at the PayPal end.
3. If the customer left and never completed payment ... then they changed their mind.
The *why* behind abandoning the purchase could be any number of things.
You could email them and ask.



