Motion Blur problem on Superspray Particles

[HowardDay]

In VRay NEXT GPU 1.1 in 3dsMAX 2018.3 , I'm seeing some very much oddness with motion blur on Superspray particles. In an animation, when I'm using them in conjunction with VRayGrid objects, the motion blur seems to break down into 2-3 "snapshots" of each particle. Removing the VRayGrid and re-rendering works properly. Any ideas?
Thanks!

[Miro]

I can't reproduce this. Any chance you can share a scene to support@chaosgroup.com?

[HowardDay]

I was actually able to fix the issue - somehow I'd forgotten that I'd set the particles to velocity channel #1 in the VRay properties. When I reset that back to defaults the motion blur worked as expected again. Thanks!

[Miro]

Nice. Thanks for the update