"Assign a portion of each image to each attribute" GREYED OUT

[OakemChris]

Hi to everyone,

 

I'm using Prestashop 1.6.0.11 and i'm stuck several days in the same problem and i can't advance.

 

I have a product with a lot of different attributes to customize, and i rendered all the images i need to assign for each

attribute.

 

I go to Catalog -> Products -> "my product" -> Composition (the red box) -> Assign a portion of each image to each attribute

And here i can configure the different views of my product, and the background image, BUT the boxes for assign an image to each attribute are greyed out always!.

 

I tested that on Mac, Windows 8.1, Windows 7 32bit, with IE11, IE8, Opera, Firefox, Chrome, Safari... and i can't understand what is the problem.

Anyone had the same problem?

 

Thank you to everyone,

 

Christian.