oh i read about that yesterday somewhere! their new building has PBR textures now that's why only people using the official viewer will see it correctly
I will be honest, I wish they just left it alone. I liked the old way, things were close together and easy to find. Not sure what is going on with these latest huge builds
they can put on both regular materials and PBR. It is bit more work but this white is horrible. There is no knowing when Firestorm will release the viewer