[Samba] Samba 3.5.4 strange access problem

[Veiko Kukk]

Hello,

I have a situation with my samba server (CentOS 5.5, Sernet samba 
3.5.4-43.el5 x86_64). There is one file on one share that cannot be 
accessed over samba, even admin users cannot get write access, windows 
does not even display security tab for that file. ACL and file rights 
are correct and tested, even gave 777 and rwx for every ACL group and 
user, but nothing changed, still unable to access that file. From Ubuntu 
10.04 workstation when browsing with Nautilus, this file is not even listed.
When looking at file properties from win2k workstation, 
/var/log/messages lists following:

Aug 16 15:35:31 failid smbd[10265]: [2010/08/16 15:35:31.427081,  0] 
smbd/process.c:1345(switch_message)
Aug 16 15:35:31 failid smbd[10265]:   Error: Could not change to user. 
Removing deferred open, mid=52416.
Aug 16 15:35:31 failid smbd[10265]: [2010/08/16 15:35:31.430322,  0] 
smbd/process.c:1345(switch_message)
Aug 16 15:35:31 failid smbd[10265]:   Error: Could not change to user. 
Removing deferred open, mid=52544.

 From that server I can see that file and content of it. Seems perfectly 
normal file for me.
What might cause that anomaly and how to solve it?

Thanks,
Veiko