Portfolio Size and Order
1. Make sure you're using the Fullwidth masonry style .
2. Make sure your images meet the size requirements as stated in the Masonry Sizing section of the User guide : http://themenectar.com/docs/salient.pdf
3 And last - if you want to order your items without changing the date, use this plugin: http://wordpress.org/plugins/intuitive-custom-post-order/