Why my images doesn’t works?
1. Use “featured image” feature
2. If you: - use blog mosaic you need to add featured images to the classic wp post, - use portfolio mosaic you need to add featured images to the portfolio custom post,
3. check if your cache folder (mosaico/js/chache) writeable? Source: http://www.darrenhoyt.com/2008/041/02/timthumb-php-script-released/