I use Smart Quotes for all my Word documents and have never seen a problem.
Leading and trailing quote are up "high," i.e., up near the top of the text
rather than having the leading quote dropped down to the foot of the text (I
think of this as the Spanish style but I guess others use it, too) But in
one specific document I created the Smart Quotes seem to be done in the
Spanish style. I wrote mostly in German. I can't figure out how this
happened and how to change this.