gsenas on "[Plugin: Photoswipe for NextGEN Gallery] Using Fancybox for Wordpress plugin with Photoswipe."

Try this:

In my plugin, edit ngg-photoswipe.js, and replace this:

jQuery(document).ready(function(){
	//Remove thickbox effect:
	jQuery('a.thickbox').removeClass ("thickbox");
	//Remove lightbox effect:
	jQuery('a[rel^="lightbox"]').attr("rel","");
	//Remove highslide effect:
	jQuery('a.highslide').removeClass("highslide").attr("onclick","");
	//Remove shutter effect:
	jQuery('a[class^=shutterset]').removeClass (function (index, css) { return (css.match (/\bshutterset\S+/g) || []).join(' '); });
});

with this:

jQuery(document).ready(function(){
	//Remove thickbox effect:
	jQuery('a.thickbox').removeClass ("thickbox");
	//Remove lightbox effect:
	jQuery('a[rel^="lightbox"]').attr("rel","");
	//Remove highslide effect:
	jQuery('a.highslide').removeClass("highslide").attr("onclick","");
	//Remove shutter effect:
	jQuery('a[class^=shutterset]').removeClass (function (index, css) { return (css.match (/\bshutterset\S+/g) || []).join(' '); });
	//Remove fancybox effect:
	jQuery('a.fancybox').unbind('click.fb').removeClass('fancybox');
});

Let me know if it works.