Write in NTFS using Mavericks I was able to read and write NTFS filesystems normally in Mountain Lion, but after the upgrade this stopped to work.

I installed ntfs-3g and fuse4x using homebrew in Mountain Lion and followed the instructions displayed by homebrew to finish the installation of fuse4x kernel extension.

To try to solve this problem I removed ntfs-3g, fuse4x and fuse4x-kext and reinstalled them. But this didn't solve my problem.

Does anyone know how to solve this? Thanks.
I found the proper way to do this (also works for Yosemite):

Install Homebrew and cask if you don't already have them:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
brew install caskroom/cask/brew-cask


Uninstall any previous versions of osxfuse (unsigned kexts are banned now):

brew cask uninstall osxfuse


Update Homebrew and install osxfuse and ntfs-3g

brew update
brew cask install osxfuse
brew install ntfs-3g


You need to create a symlink for mount_ntfs, in order to make drives mount automatically:

sudo mv /sbin/mount_ntfs /sbin/mount_ntfs.original 
sudo ln -s /usr/local/sbin/mount_ntfs /sbin/mount_ntfs