It’s always annoying to upgrade WordPress and then to find out 2 days later that all of your links now return a 404 error. All this depsite the fact that it was all working just fine after the update. It turns out there seemed to be some kind of global change my hosting providers mod_rewrite rules which, in turn caused the links to fail. Thankfully, I was able to correct it by adding a revised .htaccess file. It’s trivial but also disturbing seeing as how I didn’t need maintain a separate .htaccess until now.