necessary access permissions
Reset Your Home Folder Permissions and ACLS:

1) Boot into your Recovery Partition holding down command + R at the startup chime

2) Select 'Terminal' from your Utilities Menu Bar

3) Type: resetpassword

4) From the window that appears, select your boot volume and the appropriate user account

5) Click the Reset Tab under Reset Home Folder Permissions and ACLS

6) Close the pane and quit Utilities

7) Select your boot volume when presented with choose startup disk and reboot your machine

Edit (Courtesy of @Buscar's Point):

If you don't have a Recovery Partition present, you can perform the same reset while logged in using the Terminal Command below. Triple click the line, copy it, and paste it into your prompt. Supply your password when asked:

{ sudo chflags -R nouchg,nouappnd ~ $TMPDIR.. ; sudo chown -R $UID:staff ~ $_ ; sudo chmod -R u+rwX ~ $_ ; chmod -R -N ~ $_ ; } 2&gt; /dev/null


Command credit goes to Linc Davis of Apple Support Communities.