Browsing to an episode via it's image gives a 404. it's missing the
season/x part of the URL. Also when you click on the episode title it transforms the URL to one without it -> I click on it (info expands), then visit the images link and then try to return with the "back" button from the browser I also get to that 404 page.
There is also something wrong with thread notifications. They often go to a 404 and only the link from the email then works. But I currently don't have an example.