Search functions are working again, so you can tag people without pesky error 500s. The searching library we use was throwing exceptions because it relied on deprecated behavior, which broke when I updated the backend language today.
It took all of five characters of code to fix.

In other news, the Atmos team has been busy creating a new design language for the site as well as making a SPA (single-page app) frontend - in other words, the user experience as a whole will be a lot more fluid and you'll be able to say goodbye to refreshing for good. Expect to hear more news about those soon.