samba - Jan 2005 - Samba hides some files when browsing

Hi all,
i have this strange problem:
on a AIX 5.2.0.0 with Samba 2.2.5 there are several shares. I have access to all
shares and everything is working fine, but today i saw that in one of this
shares the displayed files are only 500 of 1800 files and only 4 dirs of 10.
However if i type manually a file that doesn't show i have access to it? On
the other shares all files are displayed ok. Any help will be greatly
appreciated.