Ubuntu Networking :: 10.04 LDAP Users Cannot SU To Root

I have an Openldap server and many 9.10 servers using it to check for possible ssh users. No problems there. Just brought up my first 10.04 server and went through the same procedure to allow ldap users to ssh in, works great. The problem is that ldap users cannot su to root on the 10.04 server. Only locally defined users can su to root, though they cannot su to ldap users. The local root user can su to anyone. Quick overview of how I installed ldap login:

Code:
# apt-get install libnss-ldap
# echo "session required pam_mkhomedir.so skel=/etc/skel/" >> /etc/pam.d/common-session
And added ldap to the end of these lines in /etc/nsswitch.conf:

Code:
passwd: compat ldap
group: compat ldap
shadow: compat ldap

This process has worked without a hitch on 9.10 dozens of times. So my question is, why are ldap and local users now incapable of using su across authentication mechanisms? For reference these are the error messages in /var/log/auth.log when trying to su to root from an ldap user:

Code:
Jun 14 16:17:07 server unix_chkpwd[6560]: check pass; user unknownJun 14 16:17:07 server unix_chkpwd[6560]: password check failed for user (root)
Jun 14 16:17:07 server su[6559]: pam_unix(su:auth): authentication failure; logname=ldapuser uid=2000 euid=2000 tty=/dev/pts/5 ruser=ldapuser rhost= user=root
Jun 14 16:17:09 server su[6559]: pam_authenticate: Authentication failure
Jun 14 16:17:09 server su[6559]: FAILED su for root by ldapuser
And the auth.log for trying to su to an ldap user from a local one:

Code:
Jun 14 17:18:18 server su[8473]: pam_unix(su:auth): authentication failure; logname=localuser uid=1000 euid=1000 tty=/dev/pts/0 ruser=localuser rhost= user=ldapuser
Jun 14 17:18:18 server su[8473]: Successful su for ldapuser by localuserJun 14 17:18:18 server su[8473]: + /dev/pts/0 localuser:ldapuser
Jun 14 17:18:18 server su[8473]: bad group ID `2000' for user `ldapuser': Operation not permitted