Generated pictures help!

Was wondering why when I looked at any newgens in my game there was no generated pictures on there profile. So I went to prefrences>display and sound and when I click the drop down menu for Player pictures the 'Real and Generated Pictures' option is greyed out. Is there a reason for this?

I have not downloaded any skins etc. for my game so can't understand why its not working unless it just didn't install properly. Have already searched for threads related to this problem and could only find one which was never answered.

Anyone have any ideas?

Thanks