I've installed Gravity Forms for the first time and your directory addon.
I have all fields showing in the default table view. When I place my mouse over one of the column headers it turns into a hand as it should but when I press the header nothing happens. When I right click a header and inspect the element there does appear to be JS attached to each for changing from ASC to DSC, but nothing happens.
I'm using the latest stable version of Chrome and the latest stable version of Gravity Forms and your plugin. Thanks!