Okay, Tech Support can't help. The problem seems to be that when I originally signed up for my PayPal account, I verified by linking to one of my checking accounts. But the bank that handles that checking account has changed the form of their account numbers. They now add some leading zeroes. Ergo, when PayPal asks me to enter my checking account number, it doesn't exactly match the number they have on file…nor can anyone figure out how to work around this. I am now back on hold, waiting for another department. 41 minutes.