Sprites Become Invisible (SOLVED)

What happens if you drag the Player prefab from your Sprites folder into the scene viewport, does it display fine? You don't appear to actually be using the prefabs, since the objects in your scene have black text and no (Select/Apply/Revert) at the top of their attribute window. The Hierarchy text should be Blue when you're using the prefab version.

Invertex, there are no prefabs. I don't even know what those do yet :S

Ah right, I see you only have sprites. Alright, well, I would say to just delete the object and drag the sprite back into your scene, and attach the script you have for it again. Does that work? I would look into what prefabs are and how you use them. To put it simply, you drag an object from the scene Hierarchy into your project folder, and you create a prefab of that object which exists outside the scene, and can be modified to affect the one in the scene.

Yup, that fixed it! Thank you so much, Invertex, you just saved my day :)

So what was happening there? Should I always ensure none of my Sprites are on the Default sorting layer? Why is that bad?

Awesome, that makes perfect sense. At first I found it odd that bottom layers are rendered on top of top layers (as opposed to Photoshop), but when I thought about it a bit more, I realised it's not following visual logic, but code logic. Code executes from top to bottom, so it makes sense that the later things are rendered, the more on-top they are.

Thanks again :)