I have RB3 songs that I downloaded with my Live account and songs that my wife downloaded with her account. We're on the same console, and we can both play each others' songs in Rock Band 3, regardless of who's actually signed in (me, her or both). But when I try to play her RB3 songs and she mine, we get "Content not found in available storage" and get booted right back to the main menu. Any coins we spent on power-ups for that song are gone forever.
This sucks. We have about 150+ songs downloaded between the two of us, and we've never had to remember which songs are whose. So in RB Blitz, every time we play a song that we don't know the owner for, we're risking our coins. Is this intended?