Product details page not load ecommerce css

Hi, my details page stop working.
Seams that doesn't load ecommerce css correctly, categories and category template works fine instead.
You can see it here: http://www.biothai.it/site/site/index.p ... temid=1100

Try by open one of the products.
I've done some changes on the html of the template but everything was working fine untill two days ago ...
Thank you.

Ok, this is not template related because if I enable SEF everything works.
The problem is the '&Itemid' param that's lost when I turn off SEF.
Anyway, thank you.

Hi

Are You using some SEF extension ? I've seen such problems with a 3rd party components, but You can always remove this broken url and it gets generated again.