We recommend to keep the classic Google+ until we fix things.
The new Google+ changed not only design but also communication protocols which affected Friends+Me chrome extension.
I recommend to switch back to classic Google+ until we fix all incompatibilities. Everything should be resolved within a day or two.
Thank you all for your patience.
UPDATE 11-20-2015: All’s good people 🙂 New version 1.0.0 of the Friends+Me Chrome Extension is out with full support of the new Google+ UI.
So you don’t have to worry to switch to the new Google+ UI if you want to.
Thank you all for your patience!