Hi Adam,
Thanks for the provided scene. Upon our internal tests, to render it without these artefacts in V-Ray 3.60.02, Embree have to be turned off as advised previously.
In V-Ray 3.60.03 we can't reproduce this problem and it seems to be fixed correctly. I would suggest you to double check your installation of the V-Ray 3.60.03 (mainly the vrender2017.dlr).
Best regards,