Hi Everyone,
I figured out the problem, the editor was running out of memory.
I checked the console window as suggested by Squatnet and was getting the following error::
"Error: Message queue out of memory. Try increasing 'messagequeuesize_kb' in project settings"
I checked message queue size and doubled it from 1024kb to 2048kb and the project seems to be working now.
I'm not sure what editor functionality this relates to? however my project appears to be working now. The reason I didn't catch this first time round was that the console was constantly cycling this error message making it difficult to read, I had to screenshot it lol!
Is there anywhere that goes into depth with the project settings, memory allocations, inner workings etc? I think it would be a great help if we had documentation we could fall back on in order to diagnose problems like this.
i've attached a image of what I was getting for anyone curious about this problem.
Thanks to omggomb and squatnet for your suggestions, much appreciated.