So you are using your own site correct not the demo?
Make sure you include the ajax=true parameter in your forms shortcode.
If you have a link i can see i can try to help but without more information i'm not sure where to begin.
Also there is a bug that is patched in v1.3 which should be released sometime this weekend that fixes issues with the forms not loading JS and CSS. This is easy to detect. If the form doesnt look like it normally does in a regular page then your forms JS isnt loading which would lead to problems.
If you want to patch it temporarily til the update comes out you can use this function in your themes function.php