When I open gparted it shows no ntfs support, informing ntfs-3g and ntfsprogs packages need to be installed in order to provide this support. The packages are already installed, though.
Nobody else seems to be having this problem, I couldn't find anything about it on google.
I'm on an OpenSUSE 12.2 default install using Gnome 3. I'm running 3.7 kernel from kernels repo instead of default 3.4, but I don't think this is related to the problem, since I can still mount and write on ntfs partitions.