I'm reposting this from the TyFlow forum since the developer states that this problem lies on Arnold's end.
I've got an object that has been voronoi fractured and set so that the chunks that intersect with the beam objects are deleted. The RGB-Y coloration is for testing. The red material is supposed to be a painted hull material, green would be bare metal, and blue would be a molten metal material.
The material IDs appear to be applied correctly in viewport, but when rendering using Arnold, all tyflow particles render as Yellow, which I used to represent 'error.'
Are there any fixes for this error at the moment?