(...)
Now the problem. I shut the full speed unit down for a few minutes to change locations and when I restarted it cgminer fails to start. The bone boots and I can tty into it. I can try to manually start cgminer and I get a "cgminer failed to start: Write Error".
(...)
I'm not able to find the string 'Write Error' (without caps as well) in cgminer source code.
Is it the exact error msg you get ?
If so I guess your issue is located somewhere in the OS.
Anything useful in the log file ?
*Note: journalctl is the replacement for a "less /var/log/syslog"
http://www.freedesktop.org/software/systemd/man/journalctl.html