UPDATE 14:12

The chat servers should now be operating properly again. If you still have any blank chat windows (eg. corp chat) relogging may fix it.

We are aware of a problem with chat not functioning on Tranquility. We are working on it now and will keep you updated.

We’re still investigating the exact cause although this doesn’t appear to be DDoS related.

Interesting suggestion about the in-game notification for technical issues, I’ll bring it up.