When I launch the game assets/blueprints are not loaded

Hi, I just started with UE and I followed this tutorial on youtube on how to make a Run Game Prototype, and everything went fine.

Tutorial: Blueprint Endless Runner | v4.7 | Unreal Engine - YouTube

I can play the game on the editor but if I choose to launch or package it and then play the game loads only the skybox. I can move the camera, I mean, look around with the mouse but nothing else. Mouse input is turned off in this project so it really is not loading anything it seems.

Can someone help me??

Screenshot: http://i.imgur.com/CWcDKcv.png

The ‘RunGame’ game mode was chosen in options, but was not loading, I just duplicated it and selected the new one and pronto! That was bugged for some reason.