I can set up a gallery display type in a post, eg Basic Thumbnails; choose a gallery to display and make all the settings; see the gallery thumbnails in 'Sort or Exclude Images', click save and see the first thumb in the post dialog. All working fine.
Then click preview or publish and view the post, and all that displays is the same thumb. No gallery thumbs, nothing.
I have corrected the localhost paths in Gallery/Other options as suggested in various posts but this made no difference. I've reinstalled the latest plugin, cleared caches etc.
I am stumped.