Events +: 1.2 Front End Submissions Problem

Hi -

Having problems with the front end submission form. Users can submit events fine from the front end, but they are not getting a confirmation message. When they click "PUBLISH" on the form, they just get animated GIF icon showing that their form is processing, but no message that the submission has been successful.

Any ideas what the problem might be? My theme is loading jQuery library - might there be a conflict there?

Thanks
m