So i got a new RMBP of Gumtree (UK) Base spec for £1000, with 3 battery cycles a damn good steal as i sold my old 2010 for £500. Anyway alls good, lovely machine, however i cant change my background? When i first got it, i set it as background A (just to make things easier), now when i boot into windows, shut that down and reboot back into OSX, i'll be Background B... now its not always consistent, sometimes it will change back sometimes it wont, but nevertheless, background A which is the first background i ever set will always find its way back!!! Its so awkward... Hopefully Mavericks will fix it. Unless anyone has any suggestions...? Cheers.