Items not added to shopping cart and cannot edit products

We are trying to finalize our site to take it live. Suddenly nothing will add to the cart and whenever you try to edit a product from the Admin login you can an error about the submission being empty. I have no idea what is going on and need HELP! Site is https://www.fixseals.com/index.php.

If anyone can give me suggestions it would be greatly appreciated.

Why is your site going to a secure site?

The site should not be secure unless on secure pages such as the login or checkout ...

Do you have some sort of rewrites on your server?

Your link is for www but your site, is secure without the www ...

Check the configure.php file, on the server:
/includes/configure.php

and ensure that your URL settings match what your secure ssl is ...

Try setting them to both have the www on them ...