Ok my problem is whenever I update my rock band dlc it doesn't save, and when I go onto the rock band 2 tab, I can only see the 20 free dlc and rock band imported songs. Why is this ?

I'm not sure about your first problem but the Rock Band 2 tab is supposed to only show Rock Band importable songs and the 20 free downloadable songs. The weekly downloadable content as well as the AC/DC track pack are in the Rock Band tab.

o ok that clears up that, but the rock band tab still isnt saving my scores :(