macrem
macrumors 65816
In case anyone else is interested, I found a patch here:tun & tap don't work in 64-bit kernel mode.
http://pastebin.com/mfecc895
...described here:
http://sourceforge.net/tracker/?func=detail&aid=2816874&group_id=235725&atid=1097639
The patch worked for me! 🙂