Okay, let's give this another go.
A few months ago, I installed an advanced camera tool from Garrysmod.org. However, the lua file of it overwrote how the default camera tool operates. Now the camera tool spawns cameras as non-physical objects. They can't be moved or adjusted with the physgun, and their placement action can't be undone with the z key on the keyboard.
I no longer have the advanced camera lua file, and the addon has been deleted from Garrysmod.org. My big question is this:
Is there a way that I can reset the camera's scripting to how it was originally? I'm afraid that when Gmod 13 comes that my camera will still be broken. It's frustrating trying to do screenshots like this, and I have not been able to find a solution anywhere.
If anyone reading this has the slightest clue as to how I can fix this, please, I'd very much appreciate the help.