Hustle plugin displaying shortcode issue

I'm trying to use the Hustle plugin to display a popup with an AdRotate group (a non WPMU plugin); however, when previewing the popup it shows "echo adrotate_groups(6,0,0,0);" as text instead of the image. The shortcode I used was "[adrotate group="6"]" Is this an issue with AdRotate or with the Hustle plugin? Is there a setting in Hustle that will help to get this to work?

Thanks