I got it to work without OBS, but if you are struggling to get it to work without OBS, an good alternative is to record the song and watch back and see how good you played certain sections and where you messed up the most. So not to be rude, but I don't think it is right to assume that it only works when OBS. I usually just go into the folder of my download and run the Rocksmith GUI application and I have no problem from there, except if you have to restart a song in Learn A Song, You'd have to exit the song and then press play again.