Is anybody seeing an extra column/spacer introduced into your grid following update to latest version (the 11th)?

I've attached a screen shot. What you see as three columns (save/undo, space, link) was just two columns (save/undo, link) prior to update. There is a newly-appearing narrow (15px or so) spacer, and I am unable to account for this. I don't see anything in my component setup page (fields, etc) to account for this, either, as I was hoping to see an extra "something" - which I would then remove.