Lately we've all been experiencing a lot of 404 errors on the site, especially when trying to view videos. A workaround that I have discovered is to click on the link for the POST, rather than the VIDEO. If you encounter a Page Not Found 404 error when clicking on a video, try this: From Civita's Videos gallery, click on the ... menu in the upper right and select View Post from the drop down menu. You can even open these in a new tab by right clicking.
Once the post has successfully loaded you should be able to click on the individual video you are looking for and it should load successfully.
I have no idea why this works. The URLs from both methods are exactly the same, but for some reason the videos will always load for me when clicking from the Post rather than the Gallery.
Image credit to FauxAndCroe, whose winning 404 image randomly came up when I was writing this article.