Same issue here. I have ample PayPal balance but every single time I purchase on eBay, it's charging my linked AMEX - despite claiming that "If you have a balance, we'll use it first" when I open the eBay payment preferences. EDIT: I decided to try my hand at contacting PayPal about this - and am pleasantly surprised. I opened up a "chat", described the issue and within minutes got this reply: "Upon further checking your eBay was currently in an autopay set up and your AMEX account ending in 09 was used. And good news! I have successfully updated the payment method for eBay to PayPal balance. Rest assured that the issue for using your AMEX account for eBay will not happen again." I got an email almost instantly that my "billing agreement with eBay" had been changed, which was the agent making the change for me. I look everywhere and saw no autopay option to undo myself, FWIW. Fairly confident this has been rectified though I haven't made a purchase to confirm. Hope this helps.
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