I edited group permittion on Admin CP to make unregistered user can shout on shoutbox but somehow, they just can see the shoutbox and can't shout. Is it a bug or something like that
Both v5.2.0 and v5.3.1
It's unsupported functionality, the reason why the setting was left in there was because the settings page is generated dynamically and doesn't discriminate between usergroups.
Maybe in the future we'll fully support guest posting