Autocorrect problems continue

I’ve previously posted a comment requesting help when Scrivener wasn’t autocorrecting. I found the problem and solved it. But now autocorrect isn’t working in Scrivener or Text Edit. So, it’s an Apple problem. I’ve spent ages, wasting time, trying to use offered solutions from a lot of Googling, and none work. I’ve checked and unchecked all the appropriate boxes in Scrivener and Apple, without a trace of success. Any suggestions would be much welcomed. Thanks.