Can't mount smb shares using mount.cifs with 2.6.31 kernel

Hi, everyone.  I'm experiencing a peculiar problem mounting smb
shares, and I hope someone can help.  I've tried googling for this,
but what I come up with seems to be related to much older kernels.

Since updating to 2.6.31 from 2.6.30, I am no longer able to mount SMB
shares using mount.cifs.  When I try to mount, it behaves as though
the mount succeeded (no error messages anywhere), but the mount point
is empty. If I boot up in 2.6.30, smb mounts work again, so this is
specific to 2.6.31.  Also, I have verified (to the best of my ability)
that my cifs and samba-related kernel configuration parameters are
identical.

Any idea what might be going on here?

Thanks.

-- 
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project