Suspecting bug in form siteSync
When using siteSync and a form is using the feature to "Send email notification for responses to..." > [check] List of email addresses...
I had to data-fix the receiving environment with an insert into table
insert into sf_notif_subscr_list values (null,null,'Forms','0068B960-81B5-64C2-A3A8-FF0300665429','','ThisApplicationKey')
to eliminate an alertbox when listing forms (Content > Forms)
version is 7.2
This problem has been fixed in Sitefinity 8.0. You will no longer need such scripts.
All the Best,