I had the same problem, to fix it go to admin control panel, click plugins, under plugins select editor, in the select plugin to edit section select Easy Image Display.
There will now be code displayed for sb-easy-image-display.php
Find the following code –
return do_shortcode( '[sb_gallery columns="' . $args['columns'] . '" ids="' . $ids . '" size="' . strtolower( $args['size'] ) . '" link="' . strtolower( $args['link'] ) . '" url="' . strtolower( $args['url'] ) . ' captions="' . strtolower( $args['captions'] ) . '"]' );
Change it to –
return do_shortcode( '[sb_gallery columns="' . $args['columns'] . '" ids="' . $ids . '" size="' . strtolower( $args['size'] ) . '" link="' . strtolower( $args['link'] ) . '" url="' . strtolower( $args['url'] ) . '" captions="' . strtolower( $args['captions'] ) . '"]' );
A ” was missed out in the url part, hope this helps.