MB geometric samples greater than 2 AND opacity map -> disaster

[Mnietek2707]

As in the title. In such conditions I get errors when moving time slider during IPR:

Simplified scene: MB error.zip

The rendering of the frame sequence stops after a few frames (in more complex scene than I attach here).

[^Lele^]

I can't repro it here with your scene.
Try a recent nightly, perhaps?
If that fails, you can turn embree off via maxscript: with v-ray as renderer run this

renderers.current.system_embree_moblur=false

and you'll be using the V-Ray BSP raycaster instead for motion blur.