Lorna,
Hi!
I am using 36.6 and do not have "sleep late on weekends checked" not "extra hours…" checked. All others are checked. No color effects are checked and no Disabled options are checked.
The location arrow, when clicked, tells me that it cannot find my location and wonders if I wi-fi is turned off.
As a matter of fact, location services is not working anywhere, and per the apple forums, this seems to be a suffering issue for many 10.11.4 users.
It did work well on 10.10.5, but since moving up, has been very very spotty at best.
My physical location is Izmir, turkey. The late 2011 MBP running 10.11.4 has my automatic time set to GMT+3 to account to DST.