Disk Utility
For general Mac
troubleshooting, there is a tool in OSX called “Disk Utility” which can
be used for make images of or burning images to removable media, verify
suspected corrupted installer images, and verifying the permissions of
various files.
Disk Utility can be found under HD:Applications:Utilities.

Permissions
can be set inadvertently, and can be corrupted by everyday use. This
can lead to files not being savable, applications not working or even
key combinations not registering in certain software.

First run: "Verify Disk Permissions", then once the verification is complete run: "Repair Disk Permissions"
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