I have a similar problem. Can't start a new post almost anywhere. I'd really like to send in a contribution but PayPal has a problem. All I get is this message:
We cannot process this transaction because there is a problem with the PayPal email address supplied by the seller. Please contact the seller to resolve the problem. If this payment is for an eBay listing, you can contact the seller via the "Ask Seller a Question" link on the listing page. When you have the correct email address, payment can be made at www.paypal.com.
I don't know how to let the Admin know but I think they would like to get this fixed ASAP.