Yeah the only thing I can think of that would make it not recognize the CDLC would be that file, or you didn't update the app ID with the rocksmith tool kit to change the ID to a song that you have purchaced.
My biggest issue is not losing my fingers when everything speeds up... I can play a lot of stuff, everything that i have learned from rocksmith, i just really have a problem with losing my fingers lower on the fret board.. Like down at fret 17, string 1, 2, and 3. Any tips on this?