WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: Is there a picture caption fix for 4.9 yet?, by bahead I had the same problem. Until there’s a patch, you can edit media.php in /wp-includes and change line 1566 from: . do_shortcode( $content ) . '<figcaption class="wp-caption-text" >' . $atts['caption'] . '</figcaption></figure>'; to . do_shortcode( $content ) . '<figcaption class="wp-caption-text" ' . $style . '>' . $atts['caption'] . '</figcaption></figure>'; By inserting $style in the caption, you are inserting the same max-width variable into figcaption that is used in figure. Previously, figcaption inherited the “width” attribute from figure, but it does not inherit the new “max-width” attribute from figure. IMO, this was very poor testing on the part of WP developers, who always seem to be in a rush to issue an update without conducting enough QC. Reply To: Is there a picture caption fix for 4.9 yet?