I have a custom plugin that was built by a developer which was working fine until last week Friday. The plugin is running on wordpress.com platform rather than a stand alone Wordpress.org CMS. An order listing page appearing on edit.php has a filter and search form on it which can be used for filtering the contents appearing on the list page. Technically, when when a search is done or you select your filter option and click on the Filter button, the form input values are submitted to the page URL as parameters, then the page shows the filtered contents. As of last week Friday(all of a sudden) it stopped submitting form input onto the URL as parameters. Instead, when the filter/or search button is clicked, the page just reloads and nothing happens.
Does anyone have any idea of what could be causing this and how to solve it?