First off, elisewin, profuse apologies for referring to you as "Caffinated." Obviously betraying my rank noob-osity there. Many thanks to all for your great advice! I talked with an advisor there and was told that, barring something really egregious on my part, I could expect a smooth transition to the PhD program after a year, without even the need to retake the GRE. Feeling better now, but I'm thinking I'll probably decline and try again, and at a larger number of schools, for Fall 2015 admission.
Many thanks again!