Same here. Installed 10.11.2 from Yosemite that worked fine. Have tried dozens of things not mentioned here, but nothing. Now, if you delete certain user or kernel cache, then when you restart, the location icon will show up in the menu bar, and maps will actually locate during those few seconds, but then never works after that. So, find my mac no longer works, auto time set does not work, etc. But I know all my settings are correct as it does work after cache removal just after restart. Please let me know if anyone has learned something new? Has anyone submitted a trouble ticket to apple? Don't have time now, but will do in the next few weeks... yeah bummer