Can’t remember if this was the behaviour in 1.9, but if you end a sentence with an em dash surrounded by quotation marks, the ending quotation mark will not update to a smart (curly) quote. For example:
The quick brown fox jumps over the lazy dog–"
The – will change to an em dash, but the quotation mark after the dash stay as a straight quotation mark. This applies to both double and single quotation marks.
Beta 2.9.0.3 64 bit, Windows 10.