I tried using the Enttec unit today. It did not work well at all.
It does not release when you turn off a DMX frame.
Also it seems to have a clock problem or something, I am using with a 16 channel Logic systems demux that works great on several other DMX controllers.
Off of the Enttec I am getting a glitch every so often , IF I have say a channel at full , every once in a while it will turn off very quickly then back on ?
Did you make sure you installed the latest firmware in the enttec pro?
If not, download the latest driver and the utility from enttec. You can load the latest firmware with the utility. Make sure you install the latest driver from there site. You can try to remove the driver first with THERE uninstall tool.