Andre, my server has set up each site to re-direct to the site’s home page instead of going to a 404 page. It works perfectly on the sites where I used Luminescence, Preference Pro, Circumference and Celestial Reloaded. On the two sites where I used Encounters, a 404 page comes up when an old, or incorrect, address is used. Do you have any idea why that might be?
That means your links are not valid URLs, therefore a 404 shows up. So you will need to check any redirects and make sure if you have invalid links, they need to be updated or redirected to the new paths. This won’t be a theme issue, but a permalinks issue or redirect is required here.