samba - Dec 2005 - wbinfo -u result giving in capital letter

i have a strange problem...

wbinfo -u givign me all users name in capital letters..
only after i update..samba-3.0.14a-1 to samba-3.0.20b-2

also i cant reset any permission from windows

i am using.. following configuration

[vol8]
   path = /vol08_800
   writable = yes
   valid users = @16777729
   inherit owner = yes
   inherit permissions = yes
   inherit acls = yes
   nt acl support = yes
   create mask = 0644
   directory mask = 0775
   security mask = 0755
   force security mode = 0000
   directory security mask = 0777
   force directory security mode = 0000

please.. help...
thank you in advance..

jerrynikki