Hello, In first time sorry for my poor English. I have Rocksmith 2014 original in Steam, played this in a iMac with the ultimate OS X Yosemite. From a few days ago when start Rocksmith open Steam and a tells me I have to install the game. Say yes and installation bar goes quickly. One minute or less and tell that is installed, after that it works perfectly. When exit to system Rocksmith gives a bug report. The next time run Rocksmith all this process start again. Is very frustrating. I'm secure that the game is installed in the folder, but Steam insist in installed again and again. The game es original, no cracked, no unofficial dlcs... Only ogirinal game. Anyone know what happens? Help me please... Sniff Thank you very much to all.