So, using Finder, I can locate a backed up file on an external USB drive, copy it or drag and drop it to a folder such as Documents or Downloads on OSX Lion and the progress bar will tick along till completion. The file will flicker in the directory file list for a moment and then disappear.

If I use Terminal and the cp command to do the same copy the files will stay. What's going on here and how do I fix it?

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Try relaunching Finder before anything else. – Vervious Jul 21 '11 at 4:25
Same can happen when copying files from SD or via SMB - a simple "Killall finder" solves the problem - very annoying though... – Joscha Aug 7 '11 at 12:04
From the Apple discussions forum repairing disk permissions presumably also seems to do the trick: discussions.apple.com/thread/3200189?start=30&tstart=0 - didn't test it though. – Joscha Aug 7 '11 at 12:10
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