Brian, thanks for the prompt problem solving answer.
You're absolutely correct, turning on the fixes/intersections in the map mode menu works to allow selecting an intersection in flight planning when viewing the sectional chart. However, regardless whether the fixes/intersections are checked, they still show up on the sectional leading one to believe that they could be selected - just like airports along the route.
In Vector map mode, the same check box turns the fixes/intersections on/off altogether, which is different behavior than on the sectional chart view, where checking/unchecking the box has no apparent effect until the user tries to select the fix/intersection to add to a flight plan.
I really appreciate the excellent support that the iFly team provides it's customers - wish all companies would provide such great customer service! Now back to flight planning our spring exodus west!