Whenever I search something, it first takes forever, then it displays this: http://prntscr.com/c9k1m0
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
I'm pretty sure Muse is right on that. The 500 error isn't anything to do with Search, it'd have shown up regardless of where you were trying to go in the site (and did, for me, twice tonight).
Whenever I search something, it first takes forever, then it displays this: http://prntscr.com/c9k1m0