Any ideas? 
As render starts its cashing, because no mb frame rendered emidiately. But no effect.
I am not sure what is happening, but my guess would be:
Geometry Motion Blur will not work for geometry with changing topology - this includes: changing number of faces, vertices, or normals
https://coronarenderer.freshdesk.com/support/solutions/articles/5000516180
I guess it shouldn’t be crashing, though.
Can you provide us with a scene?
Well looks like you got a point. I uploading a scene ints weight a lot. Damn i try to make an image with vray, so terrible it is ))
plz try to download Unique Download Link | WeTransfer
well anyway in helpdesk we can see: Geometry Motion Blur will not work for geometry with changing topology - this includes: changing number of faces, vertices, or normals. As you told.
So ints not a bug its a reality.
But it shouldn’t be crashing. Did you mean “crashing” in the first post?
No Maru its incredibly stable 
Its just no MB.
Vray for example support houdini generated meshes and particles through vray proxy ((
So… does it crash or not?
Oh, it’s “cashing”… should be “caching”? Pre-computation/parsing?
yep! sorry for my englosh
I cannot find the scene, do you still have it? can you reupload it?
hi, do you have the scene for me?