Why my iMac does not change picture when waking from sleep ?

My iMac has Yosemite installed, I have tried to kill the system preferences in the library but it did not solve the problem.
I restarted, PRAM, repaired system permissions, log on off, etc. and nothing, nada !
It used to work without problems, changing the picture on my desktop every time the computer was waken up.
What it could be wrong ?
I have noticed that the CPU is now above 55% most of the time and iStat says that SGProtocol Service is constantly in 99%. I don´t have a clue what that means.
Any help would be appreciated.
Thanks in advance,
Rod

OK. I found the solution.
The computer changes the picture after sleep is activated from the power button but no from a hot corner, like it used to do. Obviously is a bug.
I ruled out the iStat, SG Protocol and high CPU, which are not related with the problem.
It is not a big deal, now I set it to change the image every hour, and it works !
Thanks anyway.

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