Bxslider + chrome background fixed position

Using bxslider, I set the slides to 100% height / width and used background images. Applying background-attachement: Fixed transitions, but images are missing in most cases, if not entirely in Chrome.

background-attachement: Fixed transitions correctly vertically and horizontally in IE and vertically in Firefox, with images rendered correctly.

here's a pen ...

[http://codepen.io/RyanThompson/pen/raajXL]

      

        
        
        
      

    

Does anyone have any idea?

thank