By Bogdan Coroi
#252584
Emitters applied per geometry faces used to give bad results, so now MXCL tries to prevent that by giving you that error. When using emitters, apply the material per object, not per face.
By giacob
#252592
ok thanks
Maxwell Rhino 5.2.6.8 plugin with macOS Tahoe 26

Grazie Ferdinando, prima di aggiornare il Tahoe 26[…]

So, is this a known issue?