I am having the same issue. The error I get upon trying to drag a field up or down is:
TypeError: ‘undefined’ is not a function (evaluating ‘$.curCSS(this,’overflow’,1)’)
jquery.ui.core.js:86
Thanks
Resolved it by downloading jquery-ui-1.9.2.custom
unzipping it, then overwriting
wp-content/plugins/easy-contact-forms/js/jqui/jquery.ui.core.js
wp-content/plugins/easy-contact-forms/js/jqui/jquery.ui.mouse.js
wp-content/plugins/easy-contact-forms/js/jqui/jquery.ui.sortable.js
wp-content/plugins/easy-contact-forms/js/jqui/jquery.ui.widget.js
with the versions from inside the zip:
[unzipped jqueryui folder]development-bundle/ui/jquery.ui.core.js
[unzipped jqueryui folder]development-bundle/ui/jquery.ui.mouse.js
[unzipped jqueryui folder]development-bundle/ui/jquery.ui.sortable.js
[unzipped jqueryui folder]development-bundle/ui/jquery.ui.widget.js
i’m having the same issue as ulco.
tried ellenm1’s fix but it did not help.
i would welcome any other solution.
thank you!