My Macbook Air 11" (mid 2013 upgraded with Yosemite 10.10.1) freezes at 30% or 50% when booting.

I have tried SMC and PRAM resets at boot up but still have the problem.
I can start in safe mode OK.
Any ideas welcome.
Thanks

Thanks Ogelthorpe here is the report:
Problem description:
freezes at 50% when booting
EtreCheck version: 2.0.11 (98)
Report generated 22 November 2014 15:15:59 GMT
Hardware Information: ℹ️
  MacBook Air (11-inch, Mid 2013) (Verified)
  MacBook Air - model: MacBookAir6,1
  1 1.3 GHz Intel Core i5 CPU: 2-core
  4 GB RAM Not upgradeable
  BANK 0/DIMM0
  2 GB DDR3 1600 MHz ok
  BANK 1/DIMM0
  2 GB DDR3 1600 MHz ok
  Bluetooth: Good - Handoff/Airdrop2 supported
  Wireless:  en0: 802.11 a/b/g/n/ac
Video Information: ℹ️
  Intel HD Graphics 5000 -
  Color LCD 1366 x 768
System Software: ℹ️
  OS X 10.10.1 (14B25) - Uptime: 3:56:0
Disk Information: ℹ️
  APPLE SSD TS0128F disk0 : (121.33 GB)
  S.M.A.R.T. Status: Verified
  EFI (disk0s1) <not mounted> : 210 MB
  Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
  Macintosh HD (disk1) /  [Startup]: 120.10 GB (36.25 GB free)
  Core Storage: disk0s2 120.47 GB Online
USB Information: ℹ️
  Apple Inc. BRCM20702 Hub
  Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
  Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
  Mac App Store and identified developers
Kernel Extensions: ℹ️
  /System/Library/Extensions
  [not loaded] net.tunnelblick.tap (2780) Support
  [not loaded] net.tunnelblick.tun (2780) Support
Problem System Launch Daemons: ℹ️
  [failed] com.apple.watchdogd.plist
Launch Agents: ℹ️
  [not loaded] com.google.keystone.agent.plist Support
  [invalid?] com.kaseya.uninstall.plist Support
  [not loaded] com.oracle.java.Java-Updater.plist Support
Launch Daemons: ℹ️
  [not loaded] com.adobe.fpsaud.plist Support
  [not loaded] com.google.keystone.daemon.plist Support
  [not loaded] com.microsoft.office.licensing.helper.plist Support
  [not loaded] com.oracle.java.Helper-Tool.plist Support
  [not loaded] com.oracle.java.JavaUpdateHelper.plist Support
User Launch Agents: ℹ️
  [invalid?] com.citrixonline.GoToMeeting.G2MUpdate.plist Support
User Login Items: ℹ️
  UNKNOWN UNKNOWN (missing value)
  iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
  Dropbox UNKNOWN (missing value)
  KUsrTsk UNKNOWN (missing value)
Internet Plug-ins: ℹ️
  FlashPlayer-10.6: Version: 15.0.0.223 - SDK 10.6 Support
  QuickTime Plugin: Version: 7.7.3
  Flash Player: Version: 15.0.0.223 - SDK 10.6 Support
  Default Browser: Version: 600 - SDK 10.10
  o1dbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
  SharePointBrowserPlugin: Version: 14.2.0 - SDK 10.6 Support
  googletalkbrowserplugin: Version: 5.38.6.0 - SDK 10.8 Support
  Silverlight: Version: 5.1.30317.0 - SDK 10.6 Support
  JavaAppletPlugin: Version: Java 7 Update 71 Check version
User Internet Plug-ins: ℹ️
  CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 Support
  WebEx64: Version: 1.0 - SDK 10.6 Support
Safari Extensions: ℹ️
  AdBlock
  Translate
3rd Party Preference Panes: ℹ️
  Flash Player  Support
  Java  Support
Time Machine: ℹ️
  Time Machine not configured!
Top Processes by CPU: ℹ️
      2% WindowServer
      1% fontd
      0% AppleSpell
      0% notifyd
      0% nbagent
Top Processes by Memory: ℹ️
  421 MB Safari
  292 MB com.apple.WebKit.WebContent
  69 MB WindowServer
  60 MB ocspd
  43 MB CalendarAgent
Virtual Memory Information: ℹ️
  1.59 GB Free RAM
  1.72 GB Active RAM
  477 MB Inactive RAM
  499 MB Wired RAM
  738 MB Page-ins
  0 B Page-outs

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