Many times while working in a document, I find that I’ve lost auto spell-checking and other corrections. It’s the darnedest thing and seems completely random to me.
I type a misspelled word on purpose, and it doesn’t underline it form. I type --, and it no longer changes to an emdash automatically. Even smart quotes stop working. Now I need to figure out how to convert my entire project’s smart quotes to get things back to center.