Vigilantius

1 hour ago, Blondie said:

New Update FIX.
Steam Library -> Rocksmith 2014 -> Properties -> Betas -> (Enter beta code) = justInCaseWeNeedIt
Select the beta = previous version.

Start game as usual, new update roles back, and game works as before....

"Ubisoft has given Rocksmith 2014 community a little backdoor, but how long ???"

Just a note, that Beta code is case sensitive;  JustInCaseWeNeedIt

Same thing happening to me.  Was playing it earlier though and it worked fine.