Okay,i downloaded garrys mod standalone,non-steam version,and i ran it without problems,played it and had fun.The problems began when i tried to put addons...I downloaded some addons and put them in the addons folder...i ran gmod and when i opened the addon map it was all weird,some red error signs were hanging around and some textures were just purple-black squares...
Oh,yea and it said when i ran the map "Node graph out of date,rebuilding..."
Plz help someone!