I have noticed this couple of times, I can’t reply to users from kbin.social. The loader keeps spinning, and if you refresh, the reply doesn’t show.
Is this a known issue, or just some random network / system load issue?
Solution (also posted as a comment below) Select ‘English’ as the language for the reply, otherwise it won’t post to any instance that doesn’t have ‘undetermined’ in the languages or to kbin.social account.
Federation want working at all yesterday, there’s probably still some hiccups in the system. Ernest is working really hard though so hopefully everything will be sorted out sooner rather than later!