My brother is running on a 2011 27 inch iMac running the latest version of El Capitan. He's having an issue with the Desktop folder locking itself. He can go to 'Get Info' and unlock it, and his problems are solved for a while, but the directory re-locks itself after a while. Another odd thing is the icon on the folder. It's not even a proper El Capitan folder icon. We've tried Disk Utility and even ran Malwarebytes on it, but are at a loss. Anyone seen this icon before?