Okay, so I've run the test on the affected user account, which also is an Admin account.
Here's the result of the test:
Start time: 20:40:56 07/24/14
Model Identifier: MacBookAir6,2
System Version: OS X 10.9.4 (13E28)
Kernel Version: Darwin 13.3.0
Boot Mode: Normal
Time since boot: 1:09
USB
My Passport 0748 (Western Digital Technologies, Inc.)
USB Receiver (Logitech Inc.)
Diagnostic reports
2014-07-14 WDSecurityHelper crash
2014-07-14 iTunes hang
2014-07-14 iTunes hang
2014-07-14 iTunes hang
2014-07-16 WDSecurityHelper crash
2014-07-17 com.avast.daemon crash
2014-07-19 GameApp crash
2014-07-19 firefox hang
2014-07-20 TeslaEffect crash
2014-07-20 WDSecurityHelper crash
2014-07-21 plugin-container crash
2014-07-24 WDSecurityHelper crash
Log
Jul 24 20:38:46 [BluetoothHCIReadLocalSupportedFeatures] fails because POWER IS OFF
Jul 24 20:38:46 [BluetoothHCIBroadcomChangeLNAGainCoexsECI] fails because POWER IS OFF
Jul 24 20:38:46 [BluetoothHCIReadLocalName] fails because POWER IS OFF
Jul 24 20:38:46 [IOBluetoothHCIController][EnqueueRequestForController] -- SendHCIRequestToTransport failed, error (0xE00002D8) -- kIOReturnNotReady
Jul 24 20:38:46 [SendRawHCICommand] ### ERROR: EnqueueRequestForController failed (err=e00002d8)
Jul 24 20:39:16 [BluetoothHCISetAFHHostChannelClassification] fails because POWER IS OFF
Jul 24 20:39:16 [BluetoothHCIReadLocalSupportedFeatures] fails because POWER IS OFF
Jul 24 20:39:16 [BluetoothHCIBroadcomChangeLNAGainCoexsECI] fails because POWER IS OFF
Jul 24 20:39:16 [BluetoothHCIReadLocalName] fails because POWER IS OFF
Jul 24 20:39:16 [IOBluetoothHCIController][EnqueueRequestForController] -- SendHCIRequestToTransport failed, error (0xE00002D8) -- kIOReturnNotReady
Jul 24 20:39:16 [SendRawHCICommand] ### ERROR: EnqueueRequestForController failed (err=e00002d8)
Jul 24 20:39:46 [IOBluetoothHCIController][EnqueueRequestForController] -- SendHCIRequestToTransport failed, error (0xE00002D8) -- kIOReturnNotReady
Jul 24 20:39:46 [SendRawHCICommand] ### ERROR: EnqueueRequestForController failed (err=e00002d8)
Jul 24 20:40:16 [BluetoothHCISetAFHHostChannelClassification] fails because POWER IS OFF
Jul 24 20:40:16 [BluetoothHCIReadLocalSupportedFeatures] fails because POWER IS OFF
Jul 24 20:40:16 [BluetoothHCIBroadcomChangeLNAGainCoexsECI] fails because POWER IS OFF
Jul 24 20:40:16 [BluetoothHCIReadLocalName] fails because POWER IS OFF
Jul 24 20:40:16 [IOBluetoothHCIController][EnqueueRequestForController] -- SendHCIRequestToTransport failed, error (0xE00002D8) -- kIOReturnNotReady
Jul 24 20:40:16 [SendRawHCICommand] ### ERROR: EnqueueRequestForController failed (err=e00002d8)
Jul 24 20:40:46 [BluetoothHCISetAFHHostChannelClassification] fails because POWER IS OFF
Jul 24 20:40:46 [BluetoothHCIReadLocalSupportedFeatures] fails because POWER IS OFF
Jul 24 20:40:46 [BluetoothHCIBroadcomChangeLNAGainCoexsECI] fails because POWER IS OFF
Jul 24 20:40:46 [BluetoothHCIReadLocalName] fails because POWER IS OFF
Jul 24 20:40:46 [IOBluetoothHCIController][EnqueueRequestForController] -- SendHCIRequestToTransport failed, error (0xE00002D8) -- kIOReturnNotReady
Jul 24 20:40:46 [SendRawHCICommand] ### ERROR: EnqueueRequestForController failed (err=e00002d8)
kexts
com.avast.PacketForwarder (1.4)
com.avast.AvastFileShield (2.1.0)
Daemons
com.avast.crashreport
com.avast.account
com.avast.fileshield
com.avast.proxy
com.avast.service
com.avast.daemon
com.timesoftware.timemachineeditor.helper
com.teamviewer.service
com.teamviewer.Helper
com.oracle.java.JavaUpdateHelper
com.oracle.java.Helper-Tool
com.microsoft.office.licensing.helper
com.macpaw.CleanMyMac2.Agent
com.JWVD.cbcache
com.avast.update
com.avast.uninstall
com.avast.init
com.adobe.fpsaud
Agents
2BUA8C4S2C.com.agilebits.onepassword-osx-helper
de.metaquark.appfresh
com.avast.helper
com.yaoyuping.Loginhelper
com.paragon.ntfs.upd
com.paragon.ntfs.trial
com.teamviewer.desktop
com.teamviewer.teamviewer
com.oracle.java.Java-Updater
com.avast.userinit
com.valvesoftware.steamclean
com.macpaw.CleanMyMac2Helper.trashWatcher
com.macpaw.CleanMyMac2Helper.scheduledScan
com.google.keystone.user.agent
com.avast.home.userinit
launchd
/System/Library/LaunchAgents/com.paragon.NTFS.trial.plist
- com.paragon.ntfs.trial
/System/Library/LaunchAgents/com.paragon.NTFS.upd.plist
- com.paragon.ntfs.upd
/Library/LaunchAgents/com.avast.userinit.plist
- com.avast.userinit
/Library/LaunchAgents/com.oracle.java.Java-Updater.plist
- com.oracle.java.Java-Updater
/Library/LaunchAgents/com.teamviewer.teamviewer.plist
- com.teamviewer.teamviewer
/Library/LaunchAgents/com.teamviewer.teamviewer_desktop.plist
- com.teamviewer.desktop
/Library/LaunchDaemons/com.adobe.fpsaud.plist
- com.adobe.fpsaud
/Library/LaunchDaemons/com.avast.init.plist
- com.avast.init
/Library/LaunchDaemons/com.avast.uninstall.plist
- com.avast.uninstall
/Library/LaunchDaemons/com.avast.update.plist
- com.avast.update
/Library/LaunchDaemons/com.JWVD.cbcache.plist
- com.JWVD.cbcache
/Library/LaunchDaemons/com.macpaw.CleanMyMac2.Agent.plist
- com.macpaw.CleanMyMac2.Agent
/Library/LaunchDaemons/com.microsoft.office.licensing.helper.plist
- com.microsoft.office.licensing.helper
/Library/LaunchDaemons/com.oracle.java.Helper-Tool.plist
- com.oracle.java.Helper-Tool
/Library/LaunchDaemons/com.oracle.java.JavaUpdateHelper.plist
- com.oracle.java.JavaUpdateHelper
/Library/LaunchDaemons/com.teamviewer.Helper.plist
- com.teamviewer.Helper
/Library/LaunchDaemons/com.teamviewer.teamviewer_service.plist
- com.teamviewer.service
/Library/LaunchDaemons/com.timesoftware.timemachineeditor.helper.plist
- com.timesoftware.timemachineeditor.helper
Library/LaunchAgents/com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.UUID. plist
- com.apple.AddressBook.ScheduledSync.PHXCardDAVSource.UUID
Library/LaunchAgents/com.avast.home.userinit.plist
- com.avast.home.userinit
Library/LaunchAgents/com.google.keystone.agent.plist
- com.google.keystone.user.agent
Library/LaunchAgents/com.macpaw.CleanMyMac2Helper.scheduledScan.plist
- com.macpaw.CleanMyMac2Helper.scheduledScan
Library/LaunchAgents/com.macpaw.CleanMyMac2Helper.trashWatcher.plist
- com.macpaw.CleanMyMac2Helper.trashWatcher
Library/LaunchAgents/com.valvesoftware.steamclean.plist
- com.valvesoftware.steamclean
Library/LaunchAgents/de.metaquark.appfresh.plist
- de.metaquark.appfresh
Bundles
/Library/Internet Plug-Ins/Flash Player.plugin
- N/A
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin
- com.oracle.java.JavaAppletPlugin
/Library/Internet Plug-Ins/SharePointBrowserPlugin.plugin
- com.microsoft.sharepoint.browserplugin
/Library/Internet Plug-Ins/SharePointWebKitPlugin.webplugin
- com.microsoft.sharepoint.webkitplugin
/Library/Internet Plug-Ins/Silverlight.plugin
- com.microsoft.SilverlightPlugin
/Library/PreferencePanes/Flash Player.prefPane
- com.adobe.flashplayerpreferences
/Library/PreferencePanes/JavaControlPanel.prefPane
- com.oracle.java.JavaControlPanel
/Library/PreferencePanes/NTFSforMacOSX.prefPane
- com.paragon-software.filesystems.ntfs.prefpanel
Library/Address Book Plug-Ins/DeskConnect Plug-In.bundle
- com.deskconnect.address-book-plugin
Library/Audio/Plug-Ins/Components/A52Codec.component
- com.shepmater.A52Codec
Library/Caches/com.apple.Safari/Extensions/1Password.safariextension
- com.agilebits.onepassword4-safari
Library/Caches/com.apple.Safari/Extensions/Instapaper.safariextension
- com.instapaper.extension
Library/Caches/com.apple.Safari/Extensions/OpenIE.safariextension
- com.parallels.openinie
Library/Internet Plug-Ins/Google Earth Web Plug-in.plugin
- com.Google.GoogleEarthPlugin.plugin
Library/PreferencePanes/Notifyr.prefPane
- com.JWVD.DesktopNotifyPanel
Library/PreferencePanes/Perian.prefPane
- org.perian.PerianPane
Library/QuickTime/AC3MovieImport.component
- com.cod3r.ac3movieimport
Library/QuickTime/Perian.component
- org.perian.Perian
dylibs
/usr/lib/libUFSDNTFS.dylib
Apps
/Applications/Dropbox.app
/Volumes/My Passport for Mac/Dropbox.app
/Volumes/My Passport for Mac/OS-X essentials/Dropbox.app
Contents of /System/Library/LaunchAgents/com.paragon.NTFS.trial.plist (XML document text)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.paragon.ntfs.trial</string>
<key>ProgramArguments</key>
<array>
<string>/Library/Application Support/Paragon NTFS for Mac OS X/NTFS for Mac OS X.app/Contents/MacOS/NTFS for Mac OS X</string>
</array>
<key>RunAtLoad</key>
<true/>
<key>LimitLoadToSessionType</key>
<string>Aqua</string>
</dict>
</plist>
Contents of /System/Library/LaunchAgents/com.paragon.NTFS.upd.plist (XML document text)
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.paragon.ntfs.upd</string>
<key>ProgramArguments</key>
<array>
<string>/Applications/Paragon NTFS for Mac OS X/UpdateChecker.app/Contents/MacOS/UpdateChecker</string>
<string>service</string>
</array>
<key>RunAtLoad</key>
<true/>
<key>LimitLoadToSessionType</key>
<string>Aqua</string>
</dict>
</plist>
Font issues: 21
Firewall: On
Listeners
launchd: afpovertcp
launchd: microsoft-ds
kdc: kerberos
Safari extensions
1Password
Instapaper
Open in Internet Explorer
Restricted files: 232
Elapsed time (s): 217
END OF TEST LOG
So, I hope this makes any sense to you... 'cause I'm unfortunately not adequate up-to-par to read and understand this log-file