I've inserted some sxc.hu images into post (For example: http://www.sxc.hu/pic/m/v/v_/v_hujer/1211974_money.jpg ) and Feature Image is not generating. When I upload this image to imgur or other image sharing service it works perfectly. What's the problem? It works on some images from Sxc.hu but not all of them.
I tried another plugin for featured image generation and it returns an error like this: "Remote server does not return image".
Thanks in advance for any help.