According to the patch notes: User Interface Add-Ons should use the new send function and receive events to send communications information.


I had read they were planning to make some addon communication changes. One problem was that addons wanting to communicate across realid had to basically spam a person's realid chat. I think they've now added a more unified standard way for addons to communicate.

This likely broke some addons. I haven't done any addons that use communication though, so can't really say for sure.