Nightcap

As by your request I changed the shortcode to [gallery type="thumbnails" columns="2" ids="1144,1145"] and voila, the thumbnails are there again.

Great that you found the cause and that I could be of help tracing the problem. For now, changing the shortcode in a post will work fine until a new upgrade is available.

Thank you very much for your quick response and help, I appreciate it tremendously.

Thank you for your response Jeremy. The gallery shortcode showing is: [gallery columns="2" ids="1144,1145"]

When I go to Settings – Media the setting where you could determine which of the choices would be the default, when creating a gallery in a post, is no longer there?

In the past I made “Tiled Mosaic” the default, but many times I chose to override it, depending on the number of pictures in a post, with “Thumbnail Grid” and that worked flawlessly.

BTW This behavior started after the update last night.

Grateful for your help!