It could be your game is stuck in an older version. At least this is what happened to me after running the fix option in the installer. And I managed to fixed it by re-installing the game.
Go to options and check the upper right corner for your game version. The latest should be b1815. If for some reason your version is b1814 or older, try running the updater. If it doesn't work, use the installer to uninstall the game and re-installing. Your game skins and songs will be preserved so no need to make backups. Hopefully this works.
Go to options and check the upper right corner for your game version. The latest should be b1815. If for some reason your version is b1814 or older, try running the updater. If it doesn't work, use the installer to uninstall the game and re-installing. Your game skins and songs will be preserved so no need to make backups. Hopefully this works.