Hi TQ
Looking at the Joomlaworks documentation for both the free version of the simple gallery & the paid version, I find the paid version has features to detect multiple instances of mootools (JQuery) running and turn off extra instance. I suggest you buy the paid version. Here’s the relevent excerpt from the SIG docs.
<blockquote>Proper checks will make sure that Mootools or jQuery are not loaded multiple times. Popup engines utilizing jQuery will download the latest library version minified from the “Google AJAX Libraries API” service, which means faster load times for your website and your gallery</blockquote>
Blessings Shannon