Thread:Nakano15/@comment-25154028-20151004043513/@comment-3509554-20151004161057

NT5 will not work on the new Terraria folder, because the developers have made changes to file paths on it.

The best thing to do is try to find a pre-1.3 Content folder and when going to play the mod, rename the original and place the pre-1.3 one as the mod Content folder.