We might have found a bug when it comes to rendering Hair and Fur.
We have set our settings to render as geometry but in our scene we have 3 different spline objects with Hair and Fur modifier attached and mostly only 1 of them render at a time randomly. Sometimes none of these objects render at all.
We think this might be a bug but we could be wrong?
Can you provide us with a scene where this happens?
It would be good if you could start a new support ticket: https://coronarenderer.freshdesk.com/support/tickets/new
This is only part of the entire scene as we have merged two of the Hair and Fur objects into the scene but at least the problem is still present even in this file.
3ds max 2016 - Corona 1.4
Please see attached file 
It would be great to hear from you if you can figure out what’s causing this
HairFur_Problem.max (592 KB)
Answered in support portal too. This looks like a 3ds Max issue as the same thing happens in Scanline. Everyone is welcome to test it though…