On dialog boxes the colour is slightly different around images and text, there's a weird block around it of a slightly different tone to the background and i have no idea why. It only appears on certain types, for example the box that appears when turning private browsing on in Safari looks fine, but iTunes artwork errors and warnings about pulling out devices without ejecting them first has the colour problem.
Screenshot below where i hope it's visible:
(adjusted exposure and brightness to make difference more obvious)
Screenshot below where i hope it's visible:
(adjusted exposure and brightness to make difference more obvious)