After installing latest discourse updates and the latest version of babble (a couple of days ago, and again yesterday to see if it was fixed), I have problems with sending messages as well as the read indicator is stuck showing there are new messages.
Just now when I was unable to send a message I got a bunch of this error in the browser console:
Uncaught Error: No Reason Phrase
jQuery 13
error _application-49dab3118e527975ea48703627a0152cbe26663b7fde8423c667b094d716ae08.js:8967
jQuery 4
_ember_jquery-865569b174cc91f4563f3552f437b32c6eadf9f6c3d49eae02cfe50e5a8c7dfa.js:38573:14
jQuery 13
u self-hosted:1177
error _application-49dab3118e527975ea48703627a0152cbe26663b7fde8423c667b094d716ae08.js:8967
jQuery 4