PhotoSwipe display only one image from Views grid form
After some investigations, I hook (?) the views-view-grid-default.tpl.php and wrap the grid  within a:

&lt;div class="photoswipe-gallery"&gt; &lt;table&gt; ...&lt;/div&gt;


block and now the script take correctly all images found in the grid table. 

Of course I removed this class from the image field parameter.

Thanks