A change log would be nice, thank you.
FWIW, I just uninstalled version 2.0 of the chat client, and installed version 4.1, and pointed it at our production back-end (still running same server-side code) and everything appears OK so far. Our plan is to upgrade me, then the rest of our client apps, then upgrade the server code off-hours. I'll let you know if I see issues with those client-side-upgrade-only steps.
Thanks,
-A