"After I tune my guitar it says that I'm in tune, then it just shows the amps and nothing else happens. I can't even get to the menu with my escape key."

Hope this helps. You can find the full tutorial here.

 

NOTE: Steam and Rocksmith MUST be installed into the default directory, or RSInjector won't be able to locate and launch Rocksmith. 

Mac: DOWNLOAD
Load Steam first, then unzip the file at any location and launch RSInjector.app as a normal application instead of launching Rocksmith (either directly or from steam).
You can place the executable RSInjector.app wherever you want. It will search for Rocksmith in the normal steam install path (ie ~/Library/Application Support/Steam/SteamApps/common/Rocksmith2014/).
AGAIN: Steam must be running.

• Custom songs doesn't often work in my RS (mac)  :(

•  
  Game stops in the song scenario without bass lines

 

any help?

Are you using the stable toolkit or are you using Beta?  Try the non-Beta version of toolkit.

 

Some custom songs poison the game.  You may have to go by one-by-one and pull each one out to find the bad one.