Actually, the correct fix seems to be to use "auto" instead of "100%" for the columnWidth along with Utkarsh's jQuery solution. If you replace your script.js file with the following code it should work without error:

jQuery.noConflict();



jQuery(function(){

	jQuery('span.view-large').hide();

	myOp = 1;

	

	jQuery(window).load(function(){

		

		// Grid jQuery plugin: http://desandro.com/resources/jquery-masonry/

		

		jQuery('#sort').masonry({ 

			columnWidth: auto,

			animate: true,

			itemSelector: '.box'

			//easing: 'linear'

		}, 

		function() { jQuery(this).css({

			margin: '10px'

			});

		});

		

		// MouseOver Events

		

		jQuery('.box').hover(function(){

			jQuery('img', this).fadeTo("fast", 0.75).addClass('box-hover');

			jQuery('span.view-large', this).fadeTo("fast", 1)},

			function(){

			jQuery('img', this).fadeTo("fast", myOp).removeClass('box-hover');

			jQuery('span.view-large', this).fadeTo("fast", 0)

		});

		

		// Colorbox

		jQuery("a[rel='gallery']").colorbox();

		

	});

});



jQuery(document).ready(function(){

	jQuery('div.box').each(function(){

		var width = jQuery(this).find('img').width();

		jQuery(this).width(width);

	});

});