samba - Oct 2004 - logon script, sometimes is no executed!!! Why?!?

Hello,

I don't know what to do anymore. I've set up a Samba server domain and
some windows clients (some XP, ME, 9x). The BIG problem arises on XP.
Sometimes, some users (random) just can't login, other it logs in but
don't run the logon script. Windows Me and 9x works good...

Thanks
bruno rodrigues