I’m just getting a blank black screen, with the Eyewire links and the word “Overview”. The links work, but that’s it. “Overview” does not.
Still nothing. This is very annoying.
Game is running normally, It sounds something on your end, I would suggest sending an email to : support@eyewire.org there may be something the admins and/or devs can do to help you out. 
Did so already. Have heard nothing so far.
Changed from Firefox to Chrome, and all is apparently well again. No idea why Firefox suddenly failed.
sorry, dunno, maybe firefox did an update which messed things up, or maybe your antivirus/firewall/internet security did an update which messed things up…or none of the above…lol
Then Firefox recovered. But I’m sticking with Chrome. Until it turns on me.