I migrated the MI_Sphere from the content example into my game and also the MI_PlayerController and the MI_GameInfo.
Now I can move the sphere around with my mouse but when I’m moving my mouse to fast, the locations of the sphere resets to the middle of the screen.
But it should all work, because I adjusted it all like in the content example.
Hey Creey,
Did you include the blueprint from Content Examples called ‘BP_DemoRoom’? The reason I ask is because when I disable that blueprint from working properly, the marble moves but I don’t have to hold in the mouse for it to stay. I also noticed that when I moved the mouse too quickly, it would default into the center of the screen until I slowed the movement down.
Looking forward to hearing back from you! 
Yes that’s it!
It has to have something under it to work and I have no idea why.
But thank you very much for the quick reply! =)
You’re very welcome.