I am having a problem with the latest bfgminer 4.4.0 from github and FreeBSD 10.RELEASE.

When I have 4 x zeusminer blizzards connected on /dev/cuaU0.../dev/ucuU3 they are mining ok, with the occasional "SICK" notice popping up then resuming, however when I press "q" to quit I get the message "Shutdown signal received" and bfgminer just hangs,
it's still in the process table in the "STOP" state, even a kill -9 wont get rid of it. I have to reboot the computer, however that hangs at shutting down the USB controllers, so I have to press reset or power cycle. Fortunately the disks have sync and set the clean flag by then.

If I only miner with one zeus at a time bfgminer exits properly, but often can't find any miners next time I try and run it. Seems to be struggling with the USB ports.


Any ideas what might be going wrong?