I did as you suggested, Renee, (waited for a couple hours before republishing) and now my images are expanding correctly. It may have been the timing, but it may have been due to the following:
When I published the times it didn't work, in the initial setup I had checked the box to include Primary Photos Only, but had not checked the box labeled Photos. After publishing, I did add the check for Show Photos in the Site Settings, but the photos showed only as thumbnails.
Later, when I published I checked to include Photos (and Primary Photos only) in the initial publishing. This time it worked correctly.
Am I right that Note (Family) includes the note for the Spouse/Parents field as well as the notes for all the family facts (like marriage?). Is there a way to limit the choice to just the Spouse/Parents note?