System crashed and zwift app closed unexpectedly running on macOS Sierra

Earlier today zwift app closed unexpectedly while running on a ac Book Air with Mac OS Sierra. Is there an upgrade or setup i need to do in order to avoid this problem?

Other than that I love your app…!

Has your problem been resolved?  I have the same problem and have not been able to use the app on my MacBook Pro since last night (April 25, 2018).  I have uninstalled then installed Zwift. I have restarted my laptop. Nothing works.  When I open Zwift, the initial log in begins & then it disappears and the “ZwiftApp quit unexpectedly” message appears. When I click on “reopen” and enter my password, the window disappears and the “ZwiftApp quit unexpectedly” message reappears.