I just upgrade to cb 1.2.1 and it's still working for me!
yes, I'll check this at now too and all works fine...
rinuccio, please check:
1. JComments Avatar plugin is published and CB is selected as avatar source
2. In JComments settings mambots support is enabled (first tab in settings section)
3. In JComments settings on Rules page you don't forgot set permission to view Gravatar (this is required)