No form can be found

Hello.

I don't know since when, as only today I've realized that I was having an issue, but all my forms seems to be missing.

Actually I can see them in the tables (form, form_meta and form_view) but when previewing them I get a message like "Oops! Form cannot be found" (is in Italian and I don't know how it must look in English). The same when displaying them in a page. And when editing them, I see the same page I see for a new form.
But again, the tables does contains all data. Or it seems so.

How can I recover them?

Thanks.

I've opened a priority support ticket.
Even though I'm not very happy of how it has been handled, the issue is now solved, yes.

For future reference, before disabling themes or plugins (what you usually get told to), I strongly advice to try the "Gravity Forms Meta Recovery Tool" (http://www.gravityhelp.com/downloads/).

This may save you a lot of time and I don't understand with the support doesn't even try to ask to try this, before asking to disable plugins and themes.