If the attachments directory has the wrong permissions, you may be unable to download or upload attachments and thumbnails. You will see the issue in the ftrack log as well:

IOError: [Errno 13] Permission denied: u'/opt/ftrack_config/data/attachments/a/6/1/1/d850-4936-11e6-a61e-0026b94bafec'

To fix the issue, follow the instructions for restoring permissions.

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