Hi - sorry for cross-posting this from another thread, but got zero responses there. 

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Received (4) more Antminer U1s in today's mail.  Had a machine all ready and tested, running 2, with free slots and a nicely cooled powered USB hub just waiting for them.

Unpacked, allowed them to warm to room temp, shutdown bfgminer on the machine and plugged them in.  Restarted bfgminer and got a segmentation fault (and a hung ssh window).

Backed down to 2 and it works fine.  Added one more and it seg faulted.

Grabbed the hub, loaded it with 5 Antminers, and plugged it into machine #2, cranked up bfgminer there, and all was well (until the hub power supply gave up)

Tried 3 on machine #3 and it had no problem.

So...

#1 Any suggestion on what might be wrong on machine #1?

#2 USB power hub (solved after reading threads for a few hours)

BTW - all three machines were freshly reinstalled with Gentoo Linux within the past couple of weeks.  All are using bfgminer 3.10.0 pulled from Github.

Thanks all! 

Cassey
Hi ho, hi ho... its off to mine we go!