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.
The “fediverse” wasn’t prepared for the sudden onslaught of users it is receiving from all instances these days… I’d say it will take a few weeks before everything stabilizes and all instances get an upgraded infrastructure.
Let’s just be patient!