Catherine, nice to see you again!
I see what you mean: clicking on both the Week and Photo views produces a Page Not Found.
First off, will yo9u please try using “pretty” permalinks on your site. You can do this by heading to Settings > Pernalinks from the WordPress dashboard, selecting the “Post Name” option, then saving your settings. Try that and see if you notice a difference a difference when changing views.
If that works, great! If not, however, please try following the steps in this article. It provides several common solutions for the issues we see that are related to Page Not Found notices and could very well solve the problem.
Let’s start here and see what we find. 🙂
Cheers!
Geoff