It's not a managers problem for me. I have my own managers loaded (@semaphore not sure if you can load them all at once, might just have to do them individually). I will try your suggestion @hedgefield and report back.
Okay, I fixed the problem with the cameras (they didn't have ids) but now the current NavMesh isn't saved, so if I load a scene with a navMesh other than the initial one, it defaults back to the original.
I reinstalled the latest Unity and now it is working normally for some reason.
Sorry to waste your time!
Will have a demo ready for Vincent the Vampire soon though for people to download and play!
The save files are about 16kb, I turned off all my custom scripts but I still have the same problem.
Got the Unity Error Log, not sure if I'm reading it right but it looks like the error happens here:
AC.StateHandler:Update() (at Assets\AdventureC…