There haven't been too many updates in this thread, but I just found a fix that worked for me. My problem was that since the update to 64-bit, I would be able to choose a song and tune my guitar. However, once I tuned and moved on to the song, the game would hang at the amplifiers without starting the song. I haven't been able to play any CDLC because this happens with everything. However, just found out that if I choose to skip the tuner, the songs load up fine. Not sure if other people have figured this out also, but thought I'd throw it out there in case anyone else was still struggling.