I'm standing up a new Foreman server on Ubuntu 14.04.3, with Foreman 1.10.1 and ipmitool 1.8.13. I configure per the docs and set bmc.yml with true and ipmitool as the provider. When I configure a host to utilize the BMC feature and then navigate to the BMC tab within this host, I get a 500 error.
When I set the provider as freeipmi, I can view items as expected on the BMC tab (still unable to set IPs though).

Here is the debug from a couple days ago.
http://debugs.theforeman.org/foreman-debug-ABMvE.tar.xz