I actually got a different crash report (it was the same up until the “Assertion failed:” part), I reported it when it occurred twice. I remember that I was using my xbox controller in the editor play mode to playtest, and I disconnected it a few seconds after ending play, however I think one of the analog sticks was slightly moving as when the controller got disconnected, it was almost like the fov in editor view went to maximum (or minimum). I couldn’t get rid of this after multiple attempts of turning on and off the controller, attempting to reset the view. I eventually quit the project, and it loaded back up just fine, but as soon as I played or simulated, the crash occured. (Also using 4.6.1). Luckily I had a backup from a few hours before, so I replaced the project and all is well now!