Finder Cover Flow Icon Preview not working I'm not sure what happened but I noticed recently that the Cover Flow icon previews were missing from my files in Finder.  I'm using OSX 10.6.7.  See the screenshot below - I'm expecting a preview of the file to be shown rather than the black document icon.

How can I get the preview back?  The View Options have "Show Icon Preview" ticked.

Quicklook still works on individual files, just not in Finder.



Edit

Error message reported in Console:

/System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Contents/MacOS/quicklookd: /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Contents/MacOS/quicklookd: cannot execute binary file

(com.apple.quicklook[5107]): Exited with exit code: 126

Edit 2
Output of command suggested by @jm666

lipo -detailed_info /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Contents/MacOS/quicklookd

lipo: can't figure out the architecture type of: /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Contents/MacOS/quicklookd

After seeing the error message, I restored the previous version of quicklookd from my Time Machine backup and the problem was resolved.  I'm going to do a clean install of Snow Leopard just to make sure there are no other issues with my system.
hm. Removing my answer, because not helped.

So - you got a message into Console.log. So, come step-by-step. :)

What return this command?

lipo -detailed_info /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Contents/MacOS/quicklookd


Should this:

Fat header in: /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Contents/MacOS/quicklookd
fat_magic 0xcafebabe
nfat_arch 2
architecture x86_64
    cputype CPU_TYPE_X86_64
    cpusubtype CPU_SUBTYPE_X86_64_ALL
    offset 4096
    size 504912
    align 2^12 (4096)
architecture i386
    cputype CPU_TYPE_I386
    cpusubtype CPU_SUBTYPE_I386_ALL
    offset 512000
    size 399280
    align 2^12 (4096)