I updated to WordPress 3.13 through my Network admin menu today, and now my sub-blogs can't display posts or tag/category pages. One blog shows a 404 page, the other shows the index.php but is blank where the content would though (I haven't added a 404 page to that theme yet though). New posts also don't display.
Everything on the main blog appears to work fine.
I am not sure if I did something wrong or not (this is my first time updating a Multi-site), or if there is more I have to do.
What could the problem be?