Quicklook suddenly not working on some .mov files & most .m4v

Hi,
I'm kind of stuck here and could use some help.
Recently, I can no longer get a Quick Look view on some .mov files and many, if not all, .m4v files. They were working when I installed Mountain Lion and perhaps up until the first update. I'm not sure if this is related to the 10.8.2 update, but maybe.
What I'm noticing is that .mov files generated by Adobe After Effects, or even those perhaps converted from other formats usings MPEG Streamclip are no longer able to be Quick Looked. Also, .m4v files that were for certain converted by a 3rd party app are no longer viewable via QL. The files are not corrupt and open fine in Quicktime.
I followed the advice in this article: http://reviews.cnet.com/8301-13727_7-57355404-263/fixing-quick-look-issues-in-os -x/ with no real difference. I've also repaired permissions.
Any help or tips would be greatly appreciated. Am I missing a QL plugin?
Thanks,
Antonio

Which Flash player do they have - version 6 or better?
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