looks like you did not assign material to one face its best to post the file wyth the question
I want to add a picture to the opaque face
you create a second material select the face and asign it. and opaque face might mean it got normal inverted.
I am sorry
I applied flip to the opaque surface but it didn’t work where I might be skipping
you would need to post a link to the file to see what is wrong
I am sorry the issue is resolved needs to update the video card driver
thanks you