I had this a few months ago, I sent the payment all as normal, then the seller contacted me to say they hadn't recieved it, hence me scouting around eBay/PayPal for a reason why, and then saw that for some unknown reason it had gone through as an echeque. Next time I used PayPal I looked very carefully at everything and saw there was something set to echeque. I still don't know why it had decided to change itself, and it hasn't done it since.