Red “No Hotlinking” error

It happens because the page with the gallery is on a different host than the one where the thumbnails are coming from.

1. Go to WordPress dashboard > Plugins > Editor and select Justified Image Grid (or use an FTP client).
2. Find timthumb-config.php
3. Add the host of your website, or use the wildcards to set it up according to your needs:
   
   $ALLOWED_HOTLINKERS = array( 'SAME_HOST', // SAME_HOST allows child sites (subdomains for WMPL, CDN) e.g. en.example.com or cdn.example.co.uk //'example.com', // allow example.com NOT subdomain.example.com or www.example.com //'*example.com', // allow subdomain.example.com and also example.com and www.example.com //'*.example.com', // allow www.example.com NOT example.com 'googleusercontent.com' // Google's cached view );

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   $ALLOWED_HOTLINKERS = array( 'SAME_HOST', // SAME_HOST allows child sites (subdomains for WMPL, CDN) e.g. en.example.com or cdn.example.co.uk //'example.com', // allow example.com NOT subdomain.example.com or www.example.com //'*example.com', // allow subdomain.example.com and also example.com and www.example.com //'*.example.com', //  allow www.example.com NOT example.com 'googleusercontent.com' // Google's cached view );

While possible and easier, it's not recommended to disable the hotlinking protection altogether: