Guy who's managing content on a site send me this screenshot. It says that he's IP was blocked. But I don't see any bans in admin panel (screenshot).
Also I just noticed that if I change a language of a system on this path:
/dashboard/system/basics/multilingual
it doesn't change it even after re-log in. Something's not right here...
you can see from your settings that IP bans only last 10 minutes. Your admin may have been banned and then un-banned after 10 minutes so you wouldn't see it in the list.
Best option is to ask him to try again.