Flash gallery doesn't work when visiting website using DNS

The plugin, wordpress, and everything is all up to date as everything was downloaded within the last couple weeks and I just updated WordPress to 3.9. I’m currently using the Flash gallery and when I accessing the site via an IP address (example, 192.168.1.123), the Flash Gallery words perfectly. When I access the site via DNS (example, //samplesite/wordpress/), the flash doesn’t work and just displays one of the pictures on a smaller scale. What would be causing this?

https://wordpress.org/plugins/nextgen-gallery/