Macbook Pro changing wallpaper automatically when I log out and in?

Hi
Whenever I go on my laptop and change the wallpaper, when I turn it off and then turn it on again, it has changed to another wallpaper. It changes to the same wallpaper all the time, and I made sure that I hadn't checked "change every 30 min" or something like that and I hadn't. What's the problem?
Thanks

I was able to change mine, and have it stay after rebooting when I used IPhoto to select background picture. It may be temporary but I was too very tired of my background picture and I hope it stays until there is a fix.

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I just want to add, I have the same problem, and just want to help raise awareness of it.
1st, the problem only started recently (have been using the Thunderbolt display since it was released), I did not have this problem, and noticed it beginning only in the last month. (since January)
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Why is my computer slow?
Diagnosing network issues
Tune up your Mac here
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https://discussions.apple.com/community/notebooks/macbook_pro?view=documents

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Sign out of iMessage on all your Apple devices. Log out and log back in. Try again to sign in.
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Take the steps suggested in this support article. If you don't understand some of the steps or can't carry them out, ask for guidance.
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Test while in safe mode. After testing, reboot as usual (i.e., not in safe mode) and test again.
If iMessage worked in safe mode, but didn't work when you booted out of safe mode, stop here and post your results.
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Reinstall OS X.
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Macbook Pro changing wallpaper automatically when I log out and in?

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