Nevermind... I finally got the followin message to come up at paypal.com:
A technical problem has caused intermittent availability for members attempting to use the site. Activities such as accessing account information, paying for ended eBay listings, and using PayPal shipping functionality have been intermittently available. PayPal is continuing to work to resolve these issues. We understand the inconvenience this issue has caused for some members, and we appreciate your patience.
This is frustrating. I'm awaiting confirmation of payment for an ebay auction so I can ship.