@doo,

is hard to add the lightbox to all images using the plugin, because there may be images that you don’t want it on like logos, ads etc. That is why it is restricted to image store and gallery formatted images.

If you know a bit of jQuery you can use this code and change the selector as needed.

if( jQuery().imstouch ){
$( ".YOUR-SELECTOR_HERE" ).imstouch();
}

We also couldn’t see any javascript error, other script may be preventing the Lightbox action.