Ah..if you are used to chasing a 3 year old, troubleshooting the ensemble will be less tiring
Since you already have the if lite and it works, that seems to eliminate the computer/soundcard/software side of things and unfortunately leaves you with a seemingly "dead" rx ensemble.
I'd shoot an email to Tony anyway.
I'don't know how he handles DOA assembled kits and if you "worked on it first" it might make it worse.
But i'd also give it a "once over" with the most maginfication you have available in case you find a component that has enough solder on it to have worked once before it was shipped.