Smart quote when dialogue starts with an s.

HI. I’m writing in UK English, and the convention is to use single smart quotes for dialogue.
I have been using Scrivener for about six years and this is the first time I have had this problem, ever. (I’m on 2.7, most recent version).
When I start dialogue with an S, the opening smart quote is autocorrected to the wrong way round, so it looks like an apostrophe in a possessive (ie as it would appear in, say, Julia’s problem). This is, I repeat, a brand new problem. It is only in Scrivener, not in Word, or any of my other programs. It is driving me crazy. Anyone got any answers? Thanks

I think this one has been around for a bit now, but it’s one of those things we don’t really have much to do with. Typographic punctuation is all done by the Mac (and by the way, Microsoft Word doesn’t have much to do with how Macs work, as you might expect Microsoft uses their own technology for just about everything, all the way down to the way fonts are drawn at the pixel level), so it might shift in behaviour as new OS X versions blur by.

What I’ve noticed with this bug is that speed matters. If you type 'something fast enough then the punctuation doesn’t flip around, if you pause after the “s” then it flips. I see the same effect in TextEdit and other native Mac programs, but the delay seems to vary, as well as how easy it is to reproduce the behaviour.