in the gallery.js file, find the following code:
//tooltips
this.tips = new Tips(this.thumbs.images, {
className: 'pg-gl-tip',
offset: {'x': -125, 'y': 20},
windowPadding: {'x': 125, 'y': 125}
});
and change it to:
//tooltips
/*this.tips = new Tips(this.thumbs.images, {
className: 'pg-gl-tip',
offset: {'x': -125, 'y': 20},
windowPadding: {'x': 125, 'y': 125}
});*/