Apparently, PayPal performed a system upgrade last friday. Since this morning, bluegriffon.com's sales are experiencing severe delays between the payments done using PayPal and the notifications sent by PayPal to the shopping baskets or sellers. One of my customers has now been waiting for an hour for the notif, and my systems still have not received the notif from PayPal.

Update: this seems to be global. Other online sellers experiencing same issue. Some say the delays reach, I quote, several hours ! HEY PAYPAL WHAT'S GOING ON?!?