I've heard for some time now that the ars forum is the place to go for nerdly advice, so here's one for those of your who do D20 damage when it comes to Unix permissions/OS X Finder ...
Something happened to my Dads Macbook air within the last 24 hours. He is complaining that when he tries to open JPEG files in preview the app complains that the files are locked and he can't open ...
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