I used Vixen 3.1u2 (Build #66) with the USB DMX Dongle with multiple Freestyles and Expresses in the same DMX Universe without problem. It's configured as "DMX Pro" with comport settings 115200,8,N,1. I didn't come across any complications, just make sure you have the right comport. Vixen3 does require a bit of setup to patch elements to controller channels though - I assume you did this