This is a known issue, when we release a new version of Hylo currently open tabs will break and have to be reloaded. We need to find a way to force reload tabs or have the old version keep working until the next reload.

hmm... I had the same issue on my mobile device and desktop. I switched off wifi and onto mobile data and then the app loaded. Now after hard refresh everything loads again fine. Perhaps a Heroku glitch in edge deployment I'm not sure - but working now!