Walmart Coupon Policy changes?

i just tried to use a BoGo coupon clipped from the sunday paper. and was given the run around at the register. the cashier said they are no longer accepting BoGo's. after a bit of a struggle we were able to use them as one manager said yes and one said no but we were told it would be hit or miss and to use any more we have right away. any one else hear of a change of policy?