Thanks box after sent message no longer appears when I use on_sent_ok in advanced settings. The tracking code I used is:
on_sent_ok: "_gaq.push(['_trackEvent', 'Formul' , 'Skickat' , 'Blankett' ]);"
The tracking code should be correct and it has worked without a problem in version 3.1.2.
The version I use now is the latest 3.2.1.