After Effects warning: Could not rename the file '/Users/xxxx/Library/Preferences/Adobe/After Effects/12.0/Workspaces.1121.1407353248120481.xml' to 'Workspaces.xml'.
Mac OS has set the permissions for the preferences folder incorrectly. Set the permissions for the entire preferences folder (the 12.0 folder) to be writable.
This happens a lot with Mac OS upgrades, as opposed to fresh installations of the new OS.
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