All of a sudden I cannot get the page number, e.g. (Zikmund, 2009 p. 390) to appear in the intext citation even though the page number is the Edit Citiation page box. How do I turn this back on?
You have to choose the ref style that puts page numbers in the in text reference, whatever it is.
If you’re not using a style that works with Cited Pages, it ALWAYS works to put your page numbers in the Suffix field in Edit Citations. We have an FAQ about this here.