Preview not working on some images for mountain lion

hi.
i recently updated to mountain lion 10.8.3
ive noticed that some images arnt recognised by preview and cant be opened or viewed.
these images are in .jpg format, much like the many other image files that can be shown and recognised.
i was just wondering if anybody knew what was going on here and how to resolve it?
the images on my imac are extremely important to me as im in the design industry and need them for many things.
any help or insight would be much appreciated.
thanks in advance

i recently updated to mountain lion 10.8.3
Try repairing permissions.
Open Diisk Utillity located in HD > Applications > Utilities
Select the startup disk on the left then select the First Aid tab.
Click:  Repair Disk Permissions  
Then restart your Mac, launch Preview and see if you can open those images.
About Disk Utility's Repair Disk Permissions feature

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