Mysteriously Logging Off / Rebooting

I used to have my computer (Macbook Air) shutdown at the end of the day and Power on automatically in the morning. I've been trying to work on long tasks organizing my Aperture Libraries, and I'm finding hints that the computer is not how I left it.
When I noticed that I needed the computer to stay powered on, I disabled those settings under the Energy Preference Pane. But when I come back to the computer, I sometimes find that it is logged off, sitting at the login screen. When I log back in, most windows will reopen, but of course the tasks that I started were interrupted, not completed, and can't resume after simply re-logging on.
I can't find the setting in 10.9 to tell the computer not to automatically restart on a kernal panic. I was hoping I could catch it in the act if this is what it was doing. I also can't find a log stating that the computer logged of, or restarted for whatever reason. (Where do I look?)
One night recently, my computer was at a screen stating that Aperture canceled the log off. So I'm baffled as I don't see the computer configured to automatically logoff or shutdown. I also have not witnessed it log off or shutdown even when I working with it during late hours.
I come with this question because of the Proof that the computer was not as I left it, and It's currently not configured to log off or shutdown at a scheduled time.
Has anybody else experienced their computer automatically logging of or rebooting without purposely scheduling it to?
Steve

From the menu bar, select
 ▹ System Preferences... ▹ Security & Privacy ▹ Advanced...
and uncheck the box marked
Log out after … minutes of inactivity
If there's a closed padlock icon in the lower left corner of the preference pane, you may need to click it to unlock the settings. Enter your login password when prompted.

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Hi Everyone,
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Problem Event Name:                        APPCRASH
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Exception Offset:                                0001f8c4
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Locale ID:                                             1033
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Additional Information 2:                  e8adce1c2b9e7be834b4063ac3c53863
Additional Information 3:                  e8ad
Additional Information 4:                  e8adce1c2b9e7be834b4063ac3c53863

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Bye

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Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: 2014-04-04 03:04:24 PM
Event ID: 4634
Task Category: Logoff
Level: Information
Keywords: Audit Success
User: N/A
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Subject:
Security ID:
S-1-5-21-213254720-224688177-246369
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(username)
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(domain)
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<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
<EventID>4634</EventID>
<Version>0</Version>
<Level>0</Level>
<Task>12545</Task>
<Opcode>0</Opcode>
<Keywords>0x8020000000000000</Keywords>
<TimeCreated SystemTime="2014-04-04T13:04:24.783747600Z" />
<EventRecordID>108300</EventRecordID>
<Correlation />
<Execution ProcessID="724" ThreadID="756" />
<Channel>Security</Channel>
<Computer>(computer name.domain)</Computer>
<Security />
</System>
<EventData>
<Data Name="TargetUserSid">S-1-5-21-213254720-224688177-246369</Data>
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<Data Name="TargetDomainName">(domain)</Data>
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<Data Name="LogonType">3</Data>
</EventData>
</Event>

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DO NOT JUST PULL THE PLUG! Press and hold the power button until it shuts down fully. This can take several seconds. Once you are sure the fans are off, click the mouse a couple of times to make sure there is no response, then you can pull the plug, to be sure.
I suggest that you then start up in Safe Mode by holding the Shift key as soon as you hear the chime. The OS should start in the normal fashion, except you will see a Safe Boot legend.
Once you've logged in, bin the Finder .plist as suggest, and I'm make sure that all the Virus Barrier files are well and truly gone as well. Don't forget to check /Library/StartupItems and ~/Library/StartupItems. Once you reboot, things should be back to normal.
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Mysteriously Logging Off / Rebooting

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