Paypal has a new policy with eBay where they hold your payment until they confirmed it was received by the buyer. To avoid it you have to meet certain conditions like having a certain feedback rating and detailed seller rating. I got into a huge thing with Paypal a few months back because of this policy and despite having a 100% feedback, somewhere near 60 ratings, and selling devices including Macbooks, Wiis, Xbox, etc they still held my money.
It should show though as received but just not available under your paypal account