QuickLook and preview pane stretches images

The Finder column view preview pane and QuickLook stretch many of my photos. But when I open the same photos in Preview.app, they look normal.
Screenshot:
For example, download this image (reaver.jpg), and view it with Finder's column view. Now view it with QuickLook. It renders correctly in every other application, so there's something going wrong in how QuickLook/Finder get the image dimensions.
This problem started happening in either Mac OS X 10.8.1 or 10.8.2.
Specs:
* Finder 10.8
* QuickLook v4.0 (555.0)
* Mac OS X 10.8.2
* MacBook Pro 2009
Also posted in SuperUser.

Have you tried starting in Safe Mode and see if the problem still occurs?
Restart holding the "shift" key.
(Expect it to take longer to start this way because it runs a directory check first.)
If this works look in System Preferences > Users & Groups > Login items and disable any third party login items. Also look in /Library/Startup Items. Nothing is put in that folder by default, so anything in there is yours.

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