Copying media from the existing folder to somewhere else, then copying it back to the same location, replacing the file, does not seem to work for me. All the other clips in that same folder import just fine. This particular file seems to be the exception.
To make this work, I'm content to just move the file to a different location, and import from there.
For informational purposes, here are the permissions:
Volume (Ignore ownership on this volume is checked):
drwxrwxr-x 31 mark.lea staff 1122 Mar 4 15:27 Iomega_HDD
Directory (directories above this have the exact same permissions):
drwxr-xr-x 42 mark.lea staff 1428 Mar 5 08:25 ProRes
File:
-rw-rw-r--@ 1 mark.lea staff 319084873 Mar 7 2012 Krankcycle-ActiveAging.mov