Are all three computers running the same version of iTunes and do they all have all the newest updates for snow leopard?
I just did snow leopard on all my machines and don't have any problems, check to see you have the same version of iTunes and snow leopard, or better yet just do software updates on all of them so they all sync correctly. If that doesn't help, you have Apple tech support on the new OS call them, they have great support.
I just did snow leopard on all my machines and don't have any problems, check to see you have the same version of iTunes and snow leopard, or better yet just do software updates on all of them so they all sync correctly. If that doesn't help, you have Apple tech support on the new OS call them, they have great support.