Preview strange thumbnails

Yesterday a weird look happened to some of my NEF Nikon RAW files in column view, they started to appear as a negative magenta image!  But only in the preview end column in Column View.  In Cover Flow they are OK, also they are fine in Icon view, the tiny icons by the file name are also fine.  The other odd thing is that not all of my RAW files are effected, just most of the recent.  Loading them into Photoshop or Nikon View NX2 they are OK and the thumbnails look fine.   But now when the strange colour versions are dragged into Preview, they too are displayed in a magenta tone with little colour and extreme contrast.  I have not alter any settings and can find no way to get them to preview correctly.  I have been using Macs for over 10 years and have never seen this effect before.   I have a iMac with OS 10.8.4. Mountain Lion, all other programs seem fine and I have run Onyx to clear all the logs and rubbish and Disc Utility to repair permissions.  Any ideas folks?

See
NEF files stopped being displayed on iPhoto and Preview
Solution
Delete or restore from Time Machine
/System/Library/CoreServices/RawCamera.bundle
/System/Library/CoreServices/RawCameraSupport.bundle
Have reloaded Camera Raw 4.07 from Time Machine and all's well again.  Phew.

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