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I've found a repeatable crash. I'm not sure if there is a way to attach a scene file, but I have one I can send that will show the error.

Trying to render a scene containing a Pflow particle system that uses shape-instances of a group causes Maxwell/3dsMax to crash. It seems to be happening during scene translation. Pointing the shape-instance to a single piece of geometry works fine. It's only when pointing to a group of geometry that the crash occurs.

3ds Max 2016 sp2 with ext2
Maxwell 3.2.0.4
Maxwell-Max 3.2.4
Windows 8.1 Pro 64bit
i7-5960x with 64GB RAM
Quadro K4200

Unfortunately, rendering groups instanced by PFlow is not possible at the moment. We will add support for this in the future, but it's not a trivial amount of work, so I don't have a release date for this feature at this moment. I have fixed the crash for the next build, so it will just skip pflow nodes which instance groups.