[Samba] Help on Winbind/Squid => Authentification work's at 75% .. cache possible ?

[Phibee Network operation Center]

Hi

i have a big problems on Winbind/squid ...

I use it for the authentification of my user but i don't know why, 
that's don't work
all time ...

On one web site, i can have the authentification on the page but after 2 
or 3 pictures are in
"not authentified" ....

He have a cache for the login/pass ?
He have a special config for squid ?

thanks for your help