I upgraded to Unity 5.5, and since I did, every single one of my materials look so crazy I can’t describe it.
I will attach an image of it.
Edit: The picture is too big! I can’t show you. :[
Edit: Yay! I decreased the size of the screenshot, so here it is! 
You need to make sure that there is no problem with anything in your scene, Debug your necessary objects if they change position, deactivate all other objects in the scene and run. If there is really something happening to the cube, it must be reproducable so that we know what is going wrong. And then we can look how to fix it.
– Ataraxxis