OK – I tried once more with 1.8.3 and this time looked more carefully at the settings. Under Miscellaneous, Auto Popup, there is a choice to be made “open on page load”. I had it set to none because I did not want my images to expand when the post was opened. I tried ‘Link with ID “fancy-box-auto”‘ and the plugin now works as expected. All is OK. But I did not add any ID so the labeling is confusing.
Thanks for your quick response.
