Hello, I am currently aware of the constantly growing list of bugs and errors that the CK is presenting however i Can't seem to get creatures to spawn in my world space at all no matter what I do to fix it. My sister also has this problem with her own mod, (both of these world spaces are interiors) however i can get creatures to spawn outside just fine. It doesnt matter if its just the creature or a encounter, it wont appear in game even though it is clearly visable on the CK.

Does anyone know a work around or will i have to wait until a patch comes out?

Is there a navmesh?

That's probably not the issue, but this sounds like a strange problem... one of countless other sadly.