Possibly. Shortly after my post, though, my brother-in-law and I decided I should try uninstalling the app, rebooting the iPad, then reinstalling. That worked. It was a slight nuisance getting all the content re-downloaded, but at least I now have the current content.
Too bad uninstall/reboot/reinstall didn't work so well for him on his Surface (similar problem), but I'll aim him at the appropriate subforum over here.
Thanks!