There seems to be a problem with the texture wrapping on the moons, if you look at them from underneath there is a very notable seam running from their south pole up to the equator where the textures do not align properly.

I am trying to get a screenshot up to display it but am having trouble linking to one right now. Fire up the map editor and scroll over to look at any moon from below though and it should be clearly visible.

I am running Windows 7 64bit with a Radeon 5700 and everything else looks fine.