I just installed Ninja Forms Lite after testing it on another WordPress site to make sure it would do what I want it to do. (It does!)
But when I installed it on the live site and configured a form, the widget shows the shortcode, not the form: http://bit.ly/LlIQpu
I've tried disabling all the plugins except for Ninja Forms Lite, but I was still just seeing the shortcode. I'm running WordPress 3.3.2 with a template called Red Fred by Mojo Themes.