I have the same problem and it's the very first time it happens to me. I'm confused, I don't know if I should ship the items and I don't know how long will it take to eBay or Paypal or whatever to process the payment and give me my money.
My ebay says there's a withold payment that's being processed (an hourglass in stead of the dollar symbol), but in my Paypal recent activity is NOTHING, no new transactions, no new payments recieved, nothing. So I don't know... I don't trust it.