Hey all, so I did download the 'Cherub Rock' and Steam does recognize the track (I did buy it on discount during the holiday season) and also Custom Forge doesn't recognize it, but yet CF recognizes some older song pack. Any idea as to how to fix this issue by chance? Honestly I haven't touched Rocksmith & CF because of this issue until thinking about this right now.

Any ideas as to how to fix this would be greatly appreciated.

I'm not sure what is your actual issue to be honest.

If I had to guess, Steam redownloaded your Rocksmith to a new location without telling you and CFSM is looking at some other location. If you go into Steam, Right click on Rocksmith, and click "Manage > Browse Local Files" and go into the DLC folder, is your custom song in there?