Currently Being ModeratedMar 16, 2013 10:03 AM (in response to AceNeerav)
I have this problem on my 10.8.2 MacBookPro also.
MacBook Pro, Retina, Mid 2012, OS X 10.8.2 (12C3103)
I've applied all published updates from the Software Update repository.
In some cases the wallpaper is simply not there, in others it defaults to the starry field cosmos image that was originally set. Further, strange behaviour occurs when I attach to the 27" Thunderbolt display, in that sometimes the wallpaper appears on the external display, and sometimes the default wallpaper appears.