Disabled world channels

I am see general chat but i cant send any message, in chat tab all world channels is grey (screen https://i.gyazo.com/09a8f75ddd0af8bc...4b346005b8.png). the problem occurs only on a lordaeron, other 3 servers is fine with that.

- /join General not helps
- deleting wtf and cache not helps
- launch w/o addons not helps

p.s. i am using client from your site

Are you above level 5? If not, that is your problem.

been having the same issue for the last 2 days, not sure if it was an update or what happened.

edit: after the server restart it's now working again.