I think I found another option, which has worked for me anyway : I live in Europe, on my Paypal account there is no option for "Make this preferred when paying online". Also, I cannot remove my bank account at the moment because there is a pending transaction, which can take 10 to 14 days to clear. I solved the problem by logging into the classic Paypal site (thank you DRLx2): https://www.paypal.com/us/cgi-bin/webscr?cmd=_profile-ach&nav=0.6.6 and disabling the direct debit authorisation (you can re-activate it anytime), so that now all Paypal payments default to my credit card...
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