This morning when I started rocksmith the debug console opened before the normal window of RS appeared and after a few seconds of displaying on debug 

 

"Game finished loading!"

"Patch verify_signature success!"

 

The game proceeds to minimize to desktop, any time I click the tab for the taskbar of RS the game opens for a second then minimizes again. I'm guessing this is because of the 3 CDLC songs I have, probably improperly installed, any help would be much appreciated :D

I have this same problem.  I removed my custom DLCs, no difference.  I also removed the .dll and RS still minimizes on startup.  I'm running RS through Steam, does that make a difference compared to the normal desktop version?

I found that Adobe Creative Cloud quick launch app was causing the issue.  After closing it out RS launches properly.

Note that Rocksmith 2014 and Rocksmith 1 are only available through steam on PC/MAC and can't be used without.