Blueprint pitfalls and death traps

I wanted to briefly add on to this that the error logs are invaluable for fixing a crash issue like this. I had one recently when porting up to 4.3 from 4.2.1, which resulted in one of the assets I had not loading its collision volumes right.

I was just about to roll back the project to a previous revision (which would have undone a fair amount of work) when I went through to the logs and found that it was one particular asset crashing - so I was able to revert that one single asset and get the project working again.