once I omitted the line %%file usd_files/usd_fundamentals/cube.usda
and also added the #usda 1.0 and everything below
all prims are black but it worked on linux now.
still no success on windows. However browser debugger shows websocket connection problems to aws.
I’ll stick to the linux box for now.
Maybe the code should just show what is needed in the usda file for rookies like me ;-)