I also had a customer spend Reward Points (paying via Paypal - Transaction Type = unique) along with using a coupon and using a Gift Certificate.

Paypal returned him to our store
He received no confirmation email
He did not receive any Reward Points for the purchase.
His Gift Certificate Account was NOT updated to relfect the GC that he used.


Note: If the customer has a transaction type of "web_accept", things seem to work properly.