So I decided to torture it by spawning thousands of actors just to see what happens, and what happened is I somehow went in limbo between playing and editing. I’m fairly new to UE4, so I’m not really sure if this is a bug or just some feature I don’t know about. Seems very unlikely lol.
Video here: - YouTube
You always can use dev tools during simulation in editor. Everything usually back on its place when you stop simulation (escape button by default). It’s handy when you need to test physics objects for example.
Do you mean play or simulation? Because that wasn’t simulation.
It’s same thing I believe. The only difference I know is you have no pawn at the beginning of simulation, but you can simply take control over one (if existing) by pressing F8. Same button turn “play” into “simulation” I believe, since you abandon your pawn with it.
Ok, I think that’s exactly what happened there. Just not sure why, because I never pressed F8.
Thanks for the answer, so it is a thing actually 
You probably blocked your player spawn with those rocks so player didn’t spawned. Consider marking thread as solved 