Howdy!
I was messing around with the Atmos lighting plugin as I just discovered it a few days ago, and found when certain skyboxes are applied, the reflectance property on certain materials (In my case, metal) seemingly went straight to 1, when the actual parts themselves remain at 0. Other meterials such as smooth plastic do not have this issue occurring.
At first I thought it was just the result of shadows, but this reflectiveness applies to all sides of the part.
Is there a workaround to this, or can this be boiled down to user error? I tend not to get too crazy with lighting, so I am extremely unfamiliar with the how to produce a fix myself.