[Samba] Files rename problem

[Pol Hallen]

Hi folks

i using debian stable (with samba v3.0.24-6)

When I try to rename (from windows host) a file in the sharing of samba, the 
file isn't renamed :-/

Example:
readme.txt 
to
Readme.txt (i renamed only the letter R)
I press enter (and f5 to refresh) but the file is always readme.txt

Instead if i rename completly the file (all letters) the rename is correct 
(Readme.txt)

Why? 

I remember that old version of samba doesn't have this problem.

Can I resolve this problem?

Thanks!
Regards 
Pol