When I tried to use my CC with a vagabond2 and any of my X lights (x1600, x3200) I got no pop (or sporadic pop) but mostly a beep from the x1600.  As soon as I unplugged the CC phone cord from the light, everything worked correctly with the vagabond2 and the lights (and cyber syncs).
The other issue was when I used the AB lights like the AB800 and the vagabond2 with the CC, it constantly fired the light over and over again.  As soon as I unplugged the CC phone cable from the AB light, the constant pop stopped and the light worked fine with a Cyber Sync and the vagabond2.
All lights worked fine with the CC as long as they were plugged into wall power.
What might be causing this issue?
Thanks,
-Darrin
http://www.studio1930.com