I've just installed Perry's 1.2G/i386 snapshot on a new machine.

NFS works fine mounting from my 1.2D box to the 1.2G, but trying to go
the otherway... mount works, but any attempt to access the mounted fs
gets:

sjg:227$ ls /u0
ls: /u0: Permission denied
sjg:229$ mount
/dev/sd0a on / type ffs (local)
...
p166:/u0 on /u0 type nfs

The exports file says:

/u0 -alldirs -maproot=0 203.12.250.1

root/non-root get the same result, and I've checked the underlying
directories at both ends 0755 all the way.

--sjg