Lost control of pawn

So I am working on a basic ‘rolling ball’ game in UE4. My game is working fine, I control a ball with WASD Space etc. I implement some hazards, a falling death mechanic and a health system. I start work on a moving platform and program a platform to move. So far so good. However as soon as I make an apparently unrelated change (increase platform movement speed) I lose all control of the pawn. Only the platform moves, and WASD now moves the camera. What could be going on? Is this a bug?

EDIT: It’s ok, somehow I had the ‘simulate’ gamemode turned on.