Hi there,
Given your scene is basically the same with really light weight objects, I am not even sure I would use scene load and unload…when you could just swap out textures and turn visibility to objects on and off.
However if you are going to use scene load…you will want to check the background color of your parent doc and make sure its white. If it is…then your issue is with the scene you are loading…make sure its on a white project not a dark project.
A word of caution…if these pharma exhibts are displayed in the US you will have issues…as the ISI and label info has to be available and displayed any time there is mention of a drug name. You might be doing this in the parent window…don’t know but something to consider.
I have done my fair share of tradeshow booths for pharma companies and the actual physical booth legal requirements are required for digital as well.