What I’m discovering is that it’s a problem with specific pieces of CDLC. Having even one “broken” song will prevent all other CDLC files from working. I’m having to manually add tracks more or less one at a time, and so far, 10-15% of songs appear to be broken. The workflow I’m using is as follows: Start rocksmith Check all cdlc appears ok (album art loads, preview plays) Back out to start screen Command-Tab to Finder Drag a few songs into CDLC folder Command-Tab to Rocksmith Check all cdlc again If all cdlc appears ok, repeat. If cdlc is broken: Quit rocksmith Remove most recent cdlc Try adding it one by one until you find the one that breaks the game I’ll try to figure out what makes these cdlc files ruin everything... so far I’ve seen nothing in common, with regards to tracks, file size, length, special characters, etc. I’ll have to dig in with the toolkit.