The Keiro software now requires an active internet connection to verify your user account. Without internet connectivity the application may hang with a blank blue screen.
To resolve the problem connect to WiFi then relaunch the application.
If this does not resolve the problem. perform a Force Stop* of the software then relaunching should help.
*right click / 2 finger tap on the app icon, click ‘App Info’ then select the Force Stop option. You can also perform a cache clear from the same screen.