Yes, Windows updated on both my systems yesterday, sounds like that was the culprit. 

I always set my autosave for 1 minute, not sure what the default is, so far any crashes Ive had a recovery file available.

I dont think it auto saves as you go like that, its only for crash purposes, sometimes you may want to exit without saving (doing some kind of "what if "scenario), and you wouldn't want it to save random entries automatically like that.