This is a bit strange.
Has anyone else been having sudden problems with PayPal IPN - Website Standard Payment this morning?

My cart has been running fine for a year and a half, until this morning, I've received payments for 4 orders and yet, they don't appear at all in our cart nor did we get confirmation e-mails.

I've had to contact the customers to place the order again so I can know what it is they're ordering and use the "Check/Money Order" option for payment and the order shows up fine in the cart with confirmation emails.

I imagine this is a paypal issue, but I'm not sure what happened.

Any ideas?