cannot edit existing forms after domain change

I've been developing site on a temporary subdomain http://website.careerservices.ie/ and I've moved it to target domain http://www.careerservices.ie/.
The forms are working on the frontend (it's possible to submit form) and it's possible to create new forms and edit them

It's impossible to edit existing forms (created before domain change) - when I make some changes and hit "edit form" the new page loads infintely (the POST request http://www.careerservices.ie/wp-admin/admin.php?page=gf_edit_forms&id=7 fails). Whats more when I've exported all forms, deleted them and then reimported the problem still occurs - forms which were created before domain change still cannot be edited and the ones which were created already on a new domain work alright.

Thanks in advance for help.

Thanks for the links - I've used the Meta Recovery Tool and I've used also http://interconnectit.com tool - all fails. When I export a form and import it on another site with GF it works all right. When I export it and reimport it back to the original site it's still broken (even though it then has even different name and id). This is so strange.