Hi Nicolas,
I am currently testing the site and have come across an anomaly.
After placing an order, a confirmation email is sent by the site.
When I click the link in the email to display the order on the site, that is ok.
Then, when I click on a category in the content menu, it does not display the categories.
If I go to Shop on the main menu, it displays the categories and then the category menu links start to work.
I also experienced the same problem after checkout.
I tried both Firefox and Google Chrome just in case it was my browser.