Hey. Just thought I would answer this for anyone in the future who's having this problem, since I just came across it myself. It looks like the problem is that you always need to have a back-up source of funding, or it won't work. That means that if your standing Paypal balance isn't enough, then in order to use Instant Transfer from your bank account, you ALSO need to have a credit/debit card attached -- just so that it has something else to fall back on. So just make sure you NOT ONLY have your bank account linked, but also a credit/debit card, and it should auto-instant transfer by itself. 🙂
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