Timberwolf is so out of date I wouldnt even attempt to use it. The one that comes on the OS4.1FE disk works some, but still its a mess.
As far as DSI errors it has something to do with the disks being to fast or something I hear for the OS. You can ignore it. A lot of people get them in things other than Timberwolf. Its popped up for me a few times on my X5000 too. Much more since getting a SSD on it.
