I think I discovered an issue between your eWay Gravity Forms plugin 1.5.5 and the latest version of GF 1.7.7....
If conditional logic is being used in a form, with your plugin activated the form will not show.
Description of problem:
I believe that in file class.GFEwayPlugin.php on line 96 the plugin is registering jquery-ui/ui.datepicker.js which in the latest Gravity Forms is already registered in the header. Registering this twice causes the from to break.
Solution: I uncommented that line and all working fine.