Mechanique responded to my inquiry but did not have a magic bullet. They checked out my program at their facility, and experienced no issue with it. They asked how long my serail cable is (6 feet), and if I was using a MAX232 chip (yes), but could only suggest that I try enabling/disabling debug at various places in my program to help isolate the problem.

Has anyone else experienced unreliable operation of MicroCode Studio Plus on their systems?