Steps to reproduce the behavior:
Complete startup and create non cloud setup
Yep several people are having it. Also posted this issue in the Services section here: https://community.getmailspring.com/t/urgent-id-getmailspring-com-down
Cannot access account details from with in the application as well. The only way I was able to get it on a new system was to copy the data from another system and even that has annoying notification that it cannot connect.