that might explain why it's randomly happening for this user as well as other users. I don't think LDAP keeps the groups in the same order every time. I did mount this with the -t NFS4 option and...
[sshaun@upilampdev ~]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.2 Beta (Tikanga)
[sshaun@upilampdev ~]$
[sshaun@upilampdev ~]$...