I've started to get into using the creation kit and I've been following the basic tutorials very closely. I've entered my cell a number of times from the game using the coc command and it's worked flawlessly, but recently I added an enemy actor to the cell and now every time I use coc the game freezes during the loading screen.

Removing the actor allows it to load again, and I've tried it with enc and lvl actors. I've searched google but I can't find anyone else with this problem and I've combed over the tutorial to see if there was anything might have missed but I can't seem to find it. It just says drag the actor into the cell to create a reference and when you load the cell he should be there. Does anyone know what I might have done wrong? Apologies if this has been a question raised and solved before, I tried to look for an a similar problem but couldn't find one.