kmcallorum,
Do you have any other kits around (different types are ok) that can be used to verify your setup?
I'd suggest that you deconstruct your setup into smaller pieces that you them verify, piece-by-piece.
If you had a USB dongle, you could test your DMX controller and bypass the rest. The goal would be to very the controller, and some cabling, and your software.
Another idea is to verify you are getting power and signal coming out of various parts of your setup... you can use individual LEDs to create a tester -- like what I posted in this message:
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