My guess is that you are using the same plugin for multiple pages and some use a POST form and some use a GET form and you (or I) keep updating the plugin to fix one and it breaks the other.
This time you had $_POST['company'] for your child recordset filter in the plugin but your form is type "GET".
I think I updated the page to work with both by adding the line:
if (isset($_POST['company'])) $_GET['company'] = $_POST["company"];
So that now it will work with both post and get forms.