I am pretty sure this is a problem in your NFS setup. NFS limits the number of 
groups transmitted to server to 16 by default. (Some newer implementations 
extend the protocol to transmit 32 or more group memberships.)
To verify this is an NFS-related issue, try creating a local file (/tmp should 
usually be a local FS) like this (as root):
  echo hello > /tmp/localtest
  chown 0.3015 /tmp/localtest
  chmod 0640 /tmp/localtest
  su - ro2  # i assume this uses pam-ldap
  cat /tmp/localtest
  exit

if the cat works, this is a non-LDAP problem.

Also, while you're logged in as root, compare the output of
  id ro2
with the output of just
  id
when logged in as "ro2". The former shows you what nss-ldap returns, the latter 
what perms pam-ldap actually sets.The sets should be the same. :-)

-- 
using libnss-ldap, user can be member of max 16 groups
https://bugs.launchpad.net/bugs/140975
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