Insta-crash on creation undo

[fixeighted]

I just noticed this behaviour. Max crashes to desktop if I undo the creation of a sim.
I created a box, applied the waterfall preset, hit undo and it crashes every time.
This is with a clean scene from a fresh load.
Vray Next latest/latest FD

EDIT: Other crashes; rather than start more posts I'll just add to this one.

Another crash whilst adjusting a parameter for motion blur, setting it to 'force on'. I get an message saying to enable the velocity channel but then max crashes.

Crazy behaviour whilst trying to change colour of e.g. splashes - cursor becomes stuck in the colour selector window...comes back randomly after a while.

This is whilst running IPR, so maybe these things are to be expected and IPR is not supported fully yet?

[Svetlin.Nikolov]

Yess, got the crash with the waterfall preset - we broke undo for the discharge modifiers. Gonna be fixed in tomorrow's nightlies - thanks a ton for the report!

I'm writing support for V-Ray CPU IPR in Max - it's not expected to work at all currently, so anything that renders is pure luck. In the latest nightlies there is already support for Particle Shaders with 'Render as Geometry' enabled. I'm adding support for Particle Shaders in any mode currently, and then will add support for the Simulators' different render modes too...

[fixeighted]

Oh, that's odd then, as it definitely renders - it was only switching the Mblur that trashed it
Anyway, that's why presumably no other changes were possible without a restart - but coming soon, so great