Can't login to new open directory users

Question

I have a Mac Mini Server running 10.8.2 Server. I have existing users, most with no home directory and a couple with network home directories.
However, any NEW users I add (in LDAPv3), they aren't able to login. When I create the user, the "access account" option is checked and stays checked after the user is configured & saved, and stays that way when I relauch Workgroup Manager.
However, when I attempt to login to this user from a network comptuer, the "access account" checkbox gets unchecked. I can check it again and save the account, but when I reopen Workgroup Manager, it's unchecked.
Help???

Answer 1

Good tip from Francis.
Last night I finaly was able to get things back to semi normal to summarise here are some tips that worked for me.
Things first went wrong when I tried to add a new user in work group manager. After doing this I got some quite strange behaviour.
The server appeared to hang when loggin on with the new user. but ssh to the server was working.  Finally after about 10 minutes I hit the reset button on the server it appeared to go into sleep mode then automagically it logged in the user. Wow did it work .... no,   Bad news other users could no longer ssh to the server... Arrrr.  Cause tracked down to Kerberous reported as no longer running... Clients (my family )  startign to report cant access services like email ... help... 
Rather than all the pain of tryig to fix that this is what I did.
1) Back up OD in Server Admin ( not Server.app) OD dosent show up there dont know why ??
2) Make sure the DNS is working
nslookup, dig, hostname commands ... all reported correctly  forward and reverse MYSERVER.MYDOMAIN.COM. domain and IP address.  I even re-ordered the DNS name so that the local address 192.168.10.X was reported first  on my local netwrok before the external ip of the server.
3) Create a completly new OD by deleatign the old one by setting is as a stand alone then re-creating is as a new  master ( use Server Admin tool )
Finally Kerbrous all reported as runnig ... Try again to add a user...
4) Add new user in Workgroup manager open on server not remotly this didnt work.
5) set home account with apf://fqd.name/Users/ 
6) make sure home account is accessable on network.
6) set shell
7) in Server Admin give all permissions to services new user will need. such as ssh login as required.
8) in Server.app ( not Server Admin or workgroup manager )
check that new user appears.  The local OD must be in the Directory Exployer search path for this to happen
and the server must be binded to this path.
I added both /Ldap3/127.0.0.1  but also importantly /ldap3/MYSERVER.MYDOMAIN.COM
9) in Server app click on the user then select the Advanced settings. Make sure user has home dir selectd as the correct /Users folder on the server
( this was not set at first and had the value of 99  no idea why ) there are also other important settings here.
10) Finally restore OD with perevious backup to add back the rest of the users.
Apparantly this actually does a merge not a overwrite.
End state every thign finaly working .....
except the iChat/jabber server for some reasion wont accept authanicate users.... rrrr.
Bonjour works on the local network but well the point of havign a jabber server was for family in countary A to talk to grandparents  and have private secure video phone with country B so would have been nice if that worked
Good luck
Hope that helps