I found the actual problem, guys. For some reason, I cannot access the most of the UI prefabs within the UFE toolkit while using Unity 5.1.4, except for TextureIntroScreen.prefab, and when the game starts, nothing's there. I am not sure why this is happening, but it could be a crash or glitch.
To explain, the version I'm working with is 5.0.0, but I recently upgraded to 5.1.4, which reverts back to 5.0.0. The program is supposed to display the game and its content, but nothing appears. I am not sure, but this could be a compatibility issue, and I am not sure of how to uninstall Unity 5.0.0. During the only few times I've tried, it chooses to uninstall Unity 4.
How can I assess this situation?