Hi,
I read posts about this problem that were submitted a year ago to this site. I tried everything you suggested; deactivating all plug-ins, switching to WP Twenty Ten to see if it is a theme conflict; uploading the plugins one at a time to see if any particular plugin has a conflict, increasing my PHP significantly, and nothing changes. I am unable to add anything after the Form Settings field. I had W3 Cache installed and I deleted it. I cannot understand what the problem is. Perhaps you have an answer based on the issues people had a year ago?
Thanks!
Kind regards,
D