Hello!
I feel a bit of relief when i read that i am not the only one with this problem.
It is almost the same problem like "fietstasss" had. when i enter a number above 158 nothing happens anymore. The thing is it can´t depend on the number of universes, because there are three channels per led and 157*3=471 and there would be 512 at all.
my setup is an Arduino Uno + Ethernet shield + the adapted Art-Net Neopixel code from GitHub, as "fietstasss"
used.
I know there is an answer from "Cree" but aktually i don´t know how to realize your tipps.
Maybe anyone here can help me due i a have no more ideas how to solve this by myself.
Thanks a lot!!!