I've been having weird lag and connection problems yesterday and today. Just now I logged on and Carbonite gave me a message saying it couldn't open another channel and I should free some up. And when I looked at my channels, it appeared that Carbonite kept trying to make a new global channel over and over (I have the zone channel disabled). It created CrbB1 through CrbB6. I made a window and set it to show all of those channels and the only one I'm seeing anything in is CrbB1.
Incidentally, I checked the channels after reloading. Before reloading, I kept getting "You can only be in 10 channels at a time" over and over with no indication what was causing it. After reloading, I got messages that started with "CARBONITE" which answered the question.