Kodi V17.1 on El Capitan opens then freezes

Installed V17.1 on Imac running El Capitan Opened the first time and worked fine.
Next day after imac was rebooted opened Kodi but it freezes on the Kodi Krypton screen.
I uninstalled Kodi and reinstalled with the same results again.
Only way to close it is to force close it.
What’s amiss please?