A month or two ago, An "Other..." option appeared on my login screen on El Capitan. I didn't think much of it at the time. I finally got around to searching for how to get rid of it today. Turns out, that somehow the root user had become enabled. Disabling root removed the "Other..." option. That issue is fixed. But... Is there a way to tell who enabled the root user? My spouse and I each have our own passwords and both are Admin users. Could this have been a permission problem during an update? Is there a way to tell if my spouse installed something that required root? Is there an event log for root? Thanks in advance!