Ditto this! This is pretty critical, but it doesn’t appear anyone can consistently reproduce the steps, which I know is going to be a pain. 
However, the full thread on it is over here Major problem with saving. You should check it out if you haven’t already.
I unsintalled, cleaned my directories, rebooted my machine, and resinstalled. No dice, the problem still occurs.
I don’t have as screencast tool but I’ve tried to show a comprehensive scenario on what will trigger it for me over here Stuck Inspector (How To Trigger). Earlier, I shared a set of steps, but upon further testing, I discovered that it matters on which editor (in the split mode) edits are being made. I hope this helps.