Not sure if this is new or I never noticed it but it does impact the post login landing page.  Is this customizable somewhere?  I don't see it defined in FURLs.

Login and you'll be redirected to https://{yoursite}/?_fromLogin=1

It’s been there quite awhile. I’ve always seen this in stats. I don’t think this can be customized. 

This cannot be customized, I'm afraid.

OK thanks @Randy Calvert and @Jim M, minor thing! 🙂