Lost forms when site moved to other domain

Our website has around 25 forms. Before we do major updates to our site (wordpress and plugins updates) we backup the whole site and copy it to a testing domain.
But the last time we copied the site a whole bunch of the forms where lost. The forms are still listed in the backend but they're empty and in the frontend it says that the from was not found.

We copy the site as followed:
Copy the whole public_html folder
Export mysql and 'find and replace' the old domain name into new.
Than import in new database on test domain.

This worked the first couple of times.
But now it doesn't anymore.

We are affraid that if we build a new site for a client of us from a testing domain we lose the forms and have to work from scratch again.

Hope you can help us.

With regards,

Yance Bazar
IVA GROEP

I exported my forms from one site, and they imported to the new site fine. But, while they show up in the edit view, the do not display in the preview or on the pages. Hope you can help!

And, the url... http://66.147.242.99/~dogpatc1/model-call/

David,

Interestingly, changing to twenty-ten and leaving all plugins enabled fixes it, but, switching back to the theme I was using (Tersus) and disabling the "pin-it" plugin also fixes it.

Susan