Tested on 2014.11

The image variation is available, and its uri is correct.

Any tip?

Steps to reproduce:

1. Create the new article with an image in the RichText field
2. Display an article on front-end
3. Open developer tools in your browser. Find the <img... element in article content.

Result:
You should notice that element doesn't have attributes width and height.

Expected result:
img element should have width and height attributes with correct values (depending on used variation).