AT Responsive Panels - columns all display as one column only

Standard 2 column or Builder with 2 columns displays 2 columns. AT Responsive Panels do not. See screen-shots with Layout and Preview showing these scenarios.

I find this issue applies for a footheme adaptation, Corolla, the AT Subtheme and AT Core themes equally, in current versions of Chrome, Firefox and IE.

The site http://lca.karunadev.net/content/contribute is currently using the AT Responsive Panels - 2 column layout, with the layout as per the screen shot (one panel each in two columns).

Here is the Status information for the implementation:

• Drupal 7.19
• Access to update.php Protected
• CTools CSS Cache Exists
• Configuration file Protected
• Database system MySQL, MariaDB, or equivalent
• Database system version 5.5.28-cll
• Database updates Up to date
• Drupal core update status Up to date
• File system Writable (public download method)
• GD library PNG support bundled (2.0.34 compatible)
• GD library rotate and desaturate effects bundled (2.0.34 compatible)
• Module and theme update status Up to date
• PHP 5.3.17 (more information)
• PHP extensions Enabled
• PHP memory limit 320M
• PHP register globals Disabled
• Page title version Enabled (page_title table contains 0 rows)
• Superfish library Installed
• Unicode library PHP Mbstring Extension
• Update notifications Enabled
• Web server Apache
• jQuery Update jQuery 1.5.2 and jQuery UI 1.8.11

I would like to use the responsive panels for mobile device support. Your help is very much appreciated.