Inner pages are loading forever on my WP e-commerce website

Hi! I have a website (houlisbros.gr) that currently has this issue: When you are visiting the website, the frontpage loads and appears just fine. However, if you try to click one of the inner pages or product pages that are on the menu, a blue/grey circle appears and it loads forever without load the page. Can you please somebody help to solve it?
Feel free to contact with me and I can give access to the backend for invest the issue. For any questions, feel free to contact with me.