Greetings,,,
Going back over a few posts to remember any previous issues. You've got a LE to switch out the 485 chip with of course. But, if you haven't, I would try to program a start channel again. And, instead of just turning off the supply, disconnect it from the MR16. One person had the problem where it appeared to keep enough power to cause the start channel not to program correctly. And make sure the program jumper is making contact.
Have to check voltages. Other than the obvious 5V from the regulator.
Keith