My desktop wallpaper changes on its own, without my authorization

I am running OS X Yosemite 10.10.2 on a MacBook Pro. I woke up this morning at 9:30 a.m., CT, powered on my computer, and noticed that my desktop wallpaper had changed from a .jpg file that I had downloaded to one of the stock images in the OS X Desktop Wallpapers folder. This happens to me at least once a month. Has anyone else experienced this?

This is still happening. Can anyone tell me how I can pinpoint which app or process or website is placing this file in the Application Support folder of the Library?

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    Shake 'n' Bake wrote:
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