Problem with instances and materials

[madcoo]

Hi everyone,
I'm using 3DSMax 2012 x64 + just switched to Octane exporter v1.10
(I was using Octane exporter v1.00 so far)

I have a big problem with instanced objects : material changes made to the "original" object don't affect the instances, or I get a weird result!


Here's what I have in my viewport :

And here's what I get in the renderer :

Any idea about what's going on ???

Thanks in advance