I have updated to 2.5M2, everything seems to be working fine after some initial migration from 2.4.
Harmony Hub seems also working well with XMPP turned off now, but I have a problem. Sometimes the Current Activity channel won’t change when Activity changes. In the log I can see that the ActivityStarting and ActivityStarted events fire accordingly, but the Current Activity stays on the old value. Anyone having a same issue or has some advice how to solve this?