Freewall.js only loads after resize

Question

I'm using freewall.js for displaying a grid on my frontpage. But it doesn't work correct. It only loads after resize. And also after the resize it calculates false heights and puts some objects on other places where they shouldn't be.

Here's my JS:

$(function(){
    var wall = new Freewall(".freewall");
    wall.reset({
        selector: '.freewall-item',
        animate: false,
        cellW: 150,
        cellH: 'auto',
        gutterY: 15,
        gutterX: 15,
        onResize: function() {
            wall.fitWidth();
        }
    });

    wall.container.find('.event-intro-image').load(function() {
        wall.fitWidth();
    });

    $(window).trigger('resize');
});

As you can see i also tried to use $(window).trigger('resize');, without sucess.