I recently moved my site to a new server, the Gravity form on the site moved ok and is still taking entries, I have no emails being sent from that form. I've added a new form and that sends fine with same settings.
The old form also will not show when I preview.
It sounds like the form meta data is corrupt. This happens when however you migrate the data isn't done properly, for example if you are using PHPMyAdmin to export/import the data it doesn't handle serialized data correctly.
What you can try doing is downloading the Meta Recovery Tool from the Plugin Downloads page. Install and activate that plugin, it will add a Meta Recovery option to your Forms navigation. Select it and try repairing the form meta data for the form you are having a problem with.
I've completed those steps and it's fixed the admin email but there is still no user email being sent, new form still sending to both.
If the new form is working then User Notifications are working. You may want to test with a different email address and also make sure the email isn't getting flagged as spam by your email provider. If you use GMail, check the spam box.
Try re-setting up the Notifications for that form, make changes, and save them again and then test.
The Meta Recovery tool isn't guaranteed to work. Depending on how you exported/imported your database data you may have completely corrupted it and in that case you would have to create a new form. This is because some tools, such as PHPMyAdmin don't properly handle serialized data.
