Sorry I think something with my upgrading didn't work, after removing the old version again and pulling it all back it from the store it's fixed itself. There was a few little errors/warning still present but I've managed to get those sorted out, an…
Just to add, I also have the same error if I fully import the 1.50i pack from the asset store and load the demo scene (both the 2D and 3D ones). I also have a few other warning too:
The referenced script on this Behaviour is missing!UnityEngine.Reso…