I also had a buyer purchase 4 pairs of shoes in late December and the payment was to come through by e-cheque. This buyer has bought several things from me over the past year and always pays, though every time it's a bit of an ordeal, because it's always an e-cheque, it always cancels the first time and then paypal or ebay or whomever tell me to let the buyer know...and the e-cheque payment attempt doesn't seem to repeat.

Eventually, about 3 weeks later, the payment finally goes through. UGH.