Hello Jayc3D,
So from your screenshot and what you have described you placed a metallic object in your scene and then built lighting. Then you moved the object and it becomes black.
If you have static or stationary lighting in your scene a lighting build must occur in order for your objects to be calculated and lit accordingly. How this works is a pass that calculates the rays of light emanating from your light source. That calculation takes into consideration where the light rays are coming from, their angle, and how many times the light bounces.
If you move an object, once calculated, you will need to build lighting again in order for the lighting in your scene to find where that object has moved to. It expects it to be where you moved it from. That is why on movable objects, movable lights are recommended. This way the calculations is constantly being updated instead of the one pass method used by Stationary or Static lights.
This way is more expensive but gives you the freedom to adjust your objects in scene without running another lighting build.
Let me know if this helps.
Thank you,