Why are my images not shown as Thumbnails?
Please check, if there is a folder named “cache” in your WordPress theme folder for Invictus theme and its chmod is set to 777.
If not, please create this folder on your server and set its permissions to 777.
If your web-hoster doesn´t allow 777 permissions or if 777 doesn´t work, try 755 which sometimes solves the issue.
If this not fixes the problem, please open your timbthumb.php file and look for “MAX_FILE_SIZE” and increase this value.
Also see this link for further informations:http://www.der-prinz.com/images-displaying-solving-issues-timthumb-948