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.
I think some amount of federation broke a few hours ago. I haven’t been able to confirm because it seems inconsistent, but things are definitely slow to propagate to other instances and back to here. For example, I can see some of my comments have likes if I check on other instances, but when I look at my own profile, they still show 0.