same thing happened to me. sold an electronic drumkit for $700. buyer paid, I shipped (only I shipped WITH tracking). 3 months later my paypal account is frozen. I email them to find out why. apparently she filed a chargeback w/ her credit card company saying she never got it. paypal said there's nothing THEY could do about it even though i could provide a UPS tracking number that says delivered and signed by someone w/ the same last name as the buyer. from then on, i knew to never accept paypal unless it was absolutely necessary. even then, i don't accept credit card payments through paypal. i have a passionate hate for that company.