Mac Mini Background changes at boot

I'm helping a friend with her mac mini and every time she reboots it resets the background image to the Yosemite default.  She's done all the updates and she only has 1 desktop running in Mission Control.  I have tried creating a second desktop, changing it and deleting the 2nd one.  We've unchecked everything in mission control and rebooted. Every time she changes her background and reboots it goes right back to the Yosemite rock picture.

We figured it out!

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