Blizzard has updated the client for WoW Classic for Build 51056, addressing some of the issues that were in the Patch 1.14.4 Known Issues Blue Post.
Your Battle.net app should now have the latest 1.14.4 client available. When you update to this client, you’ll find that:
You can now whisper/invite/remove players from group if those players are on a different virtual realm.
Dungeon difficulty settings are removed.
