@IanM one small issue I have noticed is that if you open a new Private Discussion, close it, then try to open another, the below appears in the console
Uncaught (in promise) TypeError: Cannot read property 'toArray' of undefined
at e.n.data (PrivateDiscussionComposer.js:36)
at t.app.initializers.add.st.a.changed (index.js:44)
at t.<anonymous> (index.js:197)
at t.forEach.t.<computed> [as preventExit] (extend.js:78)
at t.e.load (ComposerState.js:49)
at t.forEach.t.<computed> [as load] (extend.js:33)
at PrivateComposing.js:24
at new Promise (<anonymous>)
at t.s.action (PrivateComposing.js:14)
at $.handleEvent (render.js:888)