display_content=0 not working

I want to use the Content Slider but not on every site. So added display_content=1 to the shortcode but nothing changed. Then I’ve set at the settingspage the option “Display” to “Image and Content Both” and gave the slider I only want to display as a imageslider display_content=0 (in Shortcode) but it’s not working and now every slider is displayed as with content.
Do you have any Idea?

http://ww.wp.xz.cn/extend/plugins/nextgen-flex-slider-template/