Like what others have said, put the old 4-prong receptacle back in. So, why did they change the code to four wires, the neutral is already grounded, right? When you're using your ground as a power source you're running current through it. Any conductor with current running through it can fail. When your neutral fails on a three wire appliance the metal cabinet becomes live. 120vac running through your body when putting wet clothes in is not a pleasant experience. I've seen two cases of a failed neutral in a three wire dryer. Luckily, nobody died.
Anyway, 99% of the dryers I see with a four-wire cord are wired improperly. The most common mistake is not separating the ground from the neutral. The white or green wire that's attached to the cabinet needs to be connected to the center terminal. Only the green wire from the cord should be attached to the cabinet.