When rendering with arnolds nodes( ArnoldUsd/ArnoldProcedural for instance) in usd stage, an error would occur telling this:
"// Error: Attempted to get value of type 'unsigned char' from VtValue holding 'TfToken' ".
I found deleting the visibility attributes in "generatedSchema.usda" from MayaUsd plugin directory could partially solve this problem, objects then could be rendered correctly. But once you hide/show these arnold nodes (made their visibility edits to the usd layer), the problem come again.
