Hi Luke,
Thanks for your feedback and sorry for the inconvenience. This isn't behaving correctly.
Would it be possible to get a copy of the file where you see the problem on? It will be very helpful for us to diagnose the issue. You can either Export the entire file as .F3d format or Share Public Link with me by enabling the download permission. Both commands are available under the File menu.
My email address: lixiong.xu@autodesk.com
Thanks for reporting this Luke,
We're tracking down a couple of issues with the priority of material assignments. Could you share the F3D with me? (or send through mail? ) john.hutchinson@autodesk.com
John
I have the same issue as well, have sent render in a different material and was surprised to find the output had wrong material on. What is the solution to this issue?
The initial post was from 2015. The likelihood that you are encountering the same bug is relatively small.
At the very least you should be posting your model.