image problem

Hi,
I’m using the hueman theme.
unfortunately every time when i insert the image url from amazon, the plugin shows me a blank image. so i see nothing. affiliate link works well.
i also marked the field image from affiliate link.
example you can see here:

http://lederhose-kaufen.de/wie-reinige-ich-eine-lederhose/

can you help me, this makes me going crazy. testing it almost two days. 😛

cheers and thank you very much.