Money Missing from my Paypal?

I sold Pork some gold the other day, and the money that he sent was in my Paypal. I had a $20+ balance from this transaction. I login today with a $0.00 balance. No, he didn't chargeback and I haven't received any notifications of any other chargebacks. Looked in my Resolution center and don't see any open cases. There's nothing after this transaction indicating the money went anywhere (transferred to bank, etc). I didn't owe paypal any money, and I wasn't in negative standing. Where could this money have gone too? Thought i'd ask here before calling up PayPal and being on hold forever.

 

Us speculating about what could have happened won't help with anything. Calling paypal will, so call them.