Quotation marks messed up in 6.2.4

users
#1

I have managed to suppress the open-close quote marks, single and
double, in all my documents, using only the straight apostrophe and
quote mark, but after updating to 6.2.4, I'm getting the curly-matched
open-close quotes I don't want..

I looked it up in the help, but the setting in Autocorrect options
looks correct even though it is behaving wrongly.

What am I missing?

Thanks.

Mark