Today I dug out the Slice, interested to see if this had been resolved. After all, this problem was first reported back in august.
After a few reboots, I actually managed to access the drive, and thought I'd update the software to the latest stable build - but after install and reboots, I'm right back where I started, with no access to the local drive. Sigh. Guess I'll pack it up again, and try in another 3 months.