Just got my latest order, 2 more gridseeds.  They didn't come with power pigtails, but I figured I'd plug them in to my powered USB hub and see what happened.  cgminer-3-7-2-gridseed detected them automatically and they started hashing away.   cgminer detected them, but they show 0 WU after 10 minutes.  The green lights blink, but no red lights like on my working units. The fans aren't running, but I'm told that doesn't matter in scrypt only mode.

Do these no longer ship with power pigtails?  Is it official that it's safe to run them in scrypt only mode without the fans?