Lightbox issues (WPX6)

Hello all,
I'm not sure if I have done something to cause this but I am having a problem with lightboxes for english site (/site/en). Example:
Site structure(each language folder dedicated):
/"original" html files
/en/html files in english language



1. in the original part ligthbox is functional
http://www.aerbit.ro/proba/1/ambalare-industriala.html
click here:

2. for another language is not functional
http://www.aerbit.ro/proba/1/en/industrial-packing.html


Name lightbox is different for each part (language)
Any clues?
Thanks!