Mark, no question that your approach and the steps you took to be sure that it was not a Tx problem were correct.
It would be very patronizing to claim that the fault is in your installations. In most cases, it is just a sure way to never debug the real cause.

As a member of Team Horizon, my main (and probably selfish) motivation is to contribute with my experiences, to have the most reliable equipment I can get. So, as you clearly said, other fellow pilots who have had problems should contribute with their experiences in a constructive, non bussiness motivated approach, to let the manufacturers know of these issues if there are similar ones. Direct communication with the manufactures is almost always the most effective way.

Thanks for taking the time for your explanation.

Jack