samba - Dec 2004 - permission problems win xp

hi guys,

i am running samba 2.2.8 as a PDC with about 30 xp clients.  i upgraded
the clients to xp about a month ago and since then i have experienced
problems with 2 users permissions.  if they access and save any file it
is rewritten with 700 permission from 750.  it doesnt seem client based
as if they log on from any machine they have the same effect.  
hope someone has some thoughts


shaun