Resolved Multilingual site - problems wiht menu

Hello,
I'm using Onepage template on Joomla 3.3
I activated and configured a multilingual site as described in your documentation section. Apparently it works fine, except when linking to a portfolio item: there is no way the template will show the right language, in fact it shows the main menu with the generic "home".
I attach two screenshots so you can see what I mean. The firts screenshot is the Spanish home, with the right menu, the second one is a portfolio item with the wrong menu in the bottom.
Same problems in English.
Thanks for your help.
URL: http://www.grupoblumeprot.es