[tqualizerman]

Thanks - I tried adding this code with my custom variables (which are working correctly):

define('USE_TRUSTED_POST_VARIABLES', true);
define('USE_TRUSTED_SCRIPT_VARS', true);

$trusted_post_variables = array(
'alt',
'label',
);

to modules/Detailed_Product_Images/config.php (as well as product_images_modify.php and product_images.php when that didn't work.) Unfortunately none of that did the trick either (cleared cache each time.)

Am I missing something maybe?