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Try changing your code from $_POST to $_ REQUEST and see if it works better.
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Try changing your code from $_POST to $_ REQUEST and see if it works better.

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Still not working. &nbsp;Could it be a timing issue?
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Still not working.  Could it be a timing issue?

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Disabling all plugins did not work.
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Did you check to see if a redirect is present? &nbsp;Use Firebug or similar to see what happens as you submit a form. &nbsp;If there is a 301 or 302 at any point after submission, the $_POST array is useless.
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Did you check to see if a redirect is present?  Use Firebug or similar to see what happens as you submit a form.  If there is a 301 or 302 at any point after submission, the $_POST array is useless.

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I am currently developing shortcode to display a list of items on a page. &nbsp;There is a form with a series of listboxes for a user to filter the list that appears. &nbsp;Here is my problem, whenever I check for the values of the &quot;$_POST&quot; variables there are always empty. &nbsp;Does wordpress have some utility that intercepts the form values before they make it to the shortcode. &nbsp;The strange thing is that if I go to the page directly and pass the value along the querystring and change from $_POST to $_GET it works. &nbsp;This is very confusing. &nbsp;Any help would be greatly appreciated.
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I am currently developing shortcode to display a list of items on a page.  There is a form with a series of listboxes for a user to filter the list that appears.  Here is my problem, whenever I check for the values of the "$_POST" variables there are always empty.  Does wordpress have some utility that intercepts the form values before they make it to the shortcode.  The strange thing is that if I go to the page directly and pass the value along the querystring and change from $_POST to $_GET it works.  This is very confusing.  Any help would be greatly appreciated.

Using wordpress shortcode to process form values

WordPress is a free and open-source content management system (CMS) based on PHP and MySQL for creating websites and blogs. Features include a plugin architecture, a template system and strong management, customization and search systems; through its dynamic presentation of content, webmasters have the flexibility to create websites easily.

WordPress

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

A web-based content management system (CMS) provides website authoring, collaboration, and administration tools that enables users with little knowledge or experience to create and manage website content. Most CMS systems use a content repository or a database to store page content, metadata, and other information assets, and a presentation component that displays the content to website visitors.