The title somewhat explains the issue. I have a template using bones. I am not sure if this matters or not.
In the functions.php file we add some additional thumbnail size options:
add_image_size( 'bones-thumb-400', 400, 300, true );
add_image_size( 'bones-thumb-300', 300, 230, true );
add_image_size( 'bones-thumb-200', 600, 200, false );
So far so good. All thumbnails are created when we upload an image. When someone uses the image editor in the media library – to crop or rotate the image – the image is saved along with the WordPress preview thumbnail. Unfortunately the custom thumbnails we have specified are not updated. They remain unchanged.
Has anyone come across this issue before?
How can we get the thumbnails specified in add_image_size to update along with the standard WordPress thumbnails?
Like it was said, WordPress only generate thumbnails in the new sizes of the new media uploaded. The old images’ thumbs doesn’t get generated automatically.
For this situation, I strongly recommend the following plugin:
http://wordpress.org/plugins/force-regenerate-thumbnails/
It is pretty simple and unobtrusive. It just adds a new item on the wp-admin menu for you to regenerate every images and its thumbs, every time you insert a new image size on your theme, all in one click.