Thanks.
so looking at the first product, i can see that the image is located here:
cannula_detail.jpg
but looking at the thumb url, i got this:
cannula_thumb.jpg
but you can see that the image is not found there, can you check to see if the thumb image is uploaded correctly under the images/product_thumb/ folder. And if it is there, we need to determine what is the url to that image, and based on that we could adjust the path.