[Samba] Wrong file size

[Drlik Zbynek]

I have kernel 2.6.7 and samba 3.0.4 running.
When I mount on same server itself shares, there is problem that files 
what have about 2-3 MB are 1-3GB big and all my programs what are depend 
on size are crashing.
I tryed kernel 2.4.26 and there it was OK.
If I mount.smbfs to another smb server it was wrong on kernel 2.6.7
If I mount.cifs to another smb server it was Ok
If I mount.cifs itself smb server it was wrong

Plese help to solve this problem.
Thanks