VRscene files exported from V-Ray 3.6 for Grasshopper cannot be rendered with the Next version of V-Ray Standalone, V-Ray for Rhino or V-Ray for Grasshopper. There are two workarounds available:
Open the .gh scheme(s) and re-export the .vrscene files using V-Ray Next;
Manually edit each affected .vrscene filefile.
Currently, exporting animated proxies having alternating faces per frame is not supportedExporting animated object generation or deletion in a proxy mesh (.vrmesh) is currently not supported. Make sure that all scene objects exist throughout the entire sequence.