Opacity adjustment not working

Hi,

I want to apply a semi-translucent plastic to my prims. When I try to adjust the Opacity Amount parameter, if it is lower than 1, the prim disappears… Do you have any idea of what could cause that?

Thank you,

I am also experiencing the same issue. Have you found a solution?

Nope, not yet…

image

This is the plastic material I would like to reproduce, thank you!