Image cannot be resized ( using Amazon Remote Images option )

That is because the images are not hosted on your server, they are hosted remotely on the Amazon Server.

We are working on a way to resize the images regardless of place they are hosted. It should be released in the next update on Codecanyon.

 

What you can do in order to regenerate the images is reimporting the products: 

http://support.aa-team.com/knowledgebase-details/179