Mesh is fine in Play mode but black in build until you reload the scene

This is driving me crazy. When I test the in build mode, everything is fine. As soon as I build and run the exe the mesh is extremely dark. (Not just black, dark. It can be illuminated and you see it has its color)

This happens with both an imported .fbx and a player model I created just by putting together a few spheres and blocks in Unity itself.

This is how it looks when playing the build:

This is how it looks immediately after reloading the level by pressing R (with Application.LoadLevel(Application.loadedLevel)):

Can someone please help me with this? I tried everything I could google up.

I found out what the problem is: The reflection probe was set to refresh mode: on awake instead of “Every frame”. Setting this to “Every frame” fixed it.