I just released version 5U.
I did find an issue on my part working with Jess.
Jess's issue was that his Nutcracker file only contained 256 pixels - not the expected 640.
Jess created a second effect - again only 256 pixels instead of 640 - so Jess is looking into the Nutcracker process.
I will now proceed to the 4096 channel USB devices -- I'm traveling so it may be a week or two.