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This problem began when I upgraded to Yosemite. I have two monitors connected to my Mac Pro. Primary monitor uses default wallpaper, and secondary monitor uses a different wallpaper (solid gray). Every time I reboot the system, the secondary monitor reverts to the default wallpaper, and Mission Control shows an additional "desktop" on the primary monitor, with a solid gray wallpaper. After rebooting many times, the list of desktops on the primary monitor grows quite long if I don't delete them manually.

I have read a tip to fix this behavior by disabling this feature in Sys Prefs, but I don't want to do that.

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1 Answer 1

Reset to default
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Cross your fingers and stand on one leg.

More seriously, you probably need to delete related plists.

Try deleting this:

/Users/<your name>/Library/Application Support/Dock/desktoppicture.db
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