The person I was doing this for tried calling Apple, that didn't help either. I'm still looking into this for her. I ran EtreCheck; nice program! Unfortunately that did not seem to find anything odd. The unexpected config file is for AVG. Everything else looks good to me.
EtreCheck version: 3.0.3 (307)
Report generated 2016-09-06 11:58:06
Download EtreCheck from https://etrecheck.com
Runtime 2:17
Performance: Excellent
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Problem: Other problem
Description:
can not enable auto login
Hardware Information: ⓘ
MacBook Pro (Retina, 15-inch, Mid 2015)
[Technical Specifications] - [User Guide] - [Warranty & Service]
MacBook Pro - model: MacBookPro11,4
1 2.2 GHz Intel Core i7 CPU: 4-core
16 GB RAM Not upgradeable
BANK 0/DIMM0
8 GB DDR3 1600 MHz ok
BANK 1/DIMM0
8 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Battery: Health = Normal - Cycle count = 7
Video Information: ⓘ
Intel Iris Pro
Color LCD 2560 x 1600
System Software: ⓘ
OS X El Capitan 10.11.6 (15G31) - Time since boot: less than an hour
Disk Information: ⓘ
APPLE SSD SM0256G disk0 : (251 GB) (Solid State - TRIM: Yes)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / : 249.80 GB (214.36 GB free)
Encrypted AES-XTS Unlocked
Core Storage: disk0s2 250.14 GB Online
USB Information: ⓘ
Apple Inc. Apple Internal Keyboard / Trackpad
Broadcom Corp. Bluetooth USB Host Controller
Thunderbolt Information: ⓘ
Apple Inc. thunderbolt_bus
Configuration files: ⓘ
/etc/sysctl.conf - File exists but not expected
Gatekeeper: ⓘ
Mac App Store and identified developers
Kernel Extensions: ⓘ
/Applications/AVG AntiVirus.app
[loaded] com.avg.Antivirus.OnAccess.kext (4791 - SDK 10.8 - 2016-09-06) [Support]
System Launch Agents: ⓘ
[not loaded] 7 Apple tasks
[loaded] 155 Apple tasks
[running] 76 Apple tasks
System Launch Daemons: ⓘ
[not loaded] 45 Apple tasks
[loaded] 152 Apple tasks
[running] 93 Apple tasks
Launch Agents: ⓘ
[running] com.avg.Antivirus.gui.plist (2015-12-08) [Support]
[running] com.mozy.status.plist (2015-10-08) [Support]
Launch Daemons: ⓘ
[loaded] com.adobe.fpsaud.plist (2016-05-09) [Support]
[loaded] com.avg.Antivirus.crashpad.plist (2015-12-08) [Support]
[running] com.avg.Antivirus.infosd.plist (2015-12-08) [Support]
[running] com.avg.Antivirus.services.plist (2015-12-08) [Support]
[loaded] com.malwarebytes.MBAMHelperTool.plist (2016-01-25) [Support]
[loaded] com.microsoft.office.licensing.helper.plist (2010-08-25) [Support]
[running] com.mozy.backup.plist (2015-10-08) [Support]
User Login Items: ⓘ
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: ⓘ
SharePointBrowserPlugin: 14.6.5 - SDK 10.6 (2016-06-26) [Support]
FlashPlayer-10.6: 21.0.0.242 - SDK 10.6 (2016-05-12) [Support]
QuickTime Plugin: 7.7.3 (2016-08-01)
Flash Player: 21.0.0.242 - SDK 10.6 (2016-05-12) Outdated! Update
Silverlight: 5.1.41212.0 - SDK 10.6 (2016-01-21) [Support]
Default Browser: 601 - SDK 10.11 (2016-08-01)
3rd Party Preference Panes: ⓘ
Flash Player (2016-05-09) [Support]
MozyHome (2016-02-04) [Support]
Time Machine: ⓘ
Time Machine not configured!
Top Processes by CPU: ⓘ
71% mds
40% mdworker(12)
4% WindowServer
1% kernel_task
1% fontd
Top Processes by Memory: ⓘ
1.07 GB kernel_task
819 MB com.apple.WebKit.WebContent(4)
492 MB softwareupdated
197 MB mdworker(12)
147 MB Safari
Virtual Memory Information: ⓘ
9.48 GB Free RAM
6.51 GB Used RAM (2.18 GB Cached)
0 B Swap Used
Diagnostics Information: ⓘ
Sep 6, 2016, 11:50:23 AM Self test - passed