After update to version 13, in the "computer & contacts" panel I see my groups and computers always whit the blue icon (online) also if they aren't online.
Going to management console on site all is ok.
I using teamviewer 13 on linux debian stable 64bit running xfce.
Solved! Go to Solution.
I switched back to teamviewer_12.0.90041_i386.deb and the icons are ok.
So there's a problem with version 13 or with amd64 package.