Be sure to publish the modules you wish before you configure their width settings in the Template Manager. Find out more...
Gantry for Joomla 2.5 has been updated to version 3.2.15 with a bug fix for saving templates changes.
Release Notes - Gantry Joomla Framework - Version 3.2.15 (J25)
• Save not working on Gantry template after Save and Close pressed.
Get Gantry for Joomla 2.5 v3.2.15