SAFE Board does not show List /Task Board when the High Security plugin is not installed.
This problem has been fixed. If you are able to upgrade, review the Fixed In section to determine the latest version with a permanent fix your instance can be upgraded to.
If a workaround is needed, in the UI macro safe_team_sprint_tracking, change the script in line 9 as follows:
dataStoreProvider.setData('team_sprint_tracking_metadata', JSON.parse('$[JS: jvar_team_sprint_tracking_metadata]'));