[qmailadmin] qmailadmin add mailbox problem

[Cdj]

Hi,
i've just installed all the qmailrocks package on a linuxbox running redhat 9, apache 1.3.28, mysql 4.0.18 , qmailadmin 1.2.10 (and tried also 1.2.9), vpopmail 5.4.13 vqadmin 2.3.6 . Everything work fine, but when i try to add user on qmailadmin (in italian) apache give me :

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request

and on the httpd logs :

[Thu May 25 13:57:09 2006] [error] [client XXX.XXX.XXX.XXX] Premature end of script headers: /usr/local/apache/cgi-bin/qmailadmin
151.42.214.26 - - [25/May/2006:13:57:09 +0200] "GET /cgi-bin/qmailadmin/com/adduser?user=postmaster&time=1148558226&dom=XXXX.com& HTTP/1.1" 500 621

and on show mailbox :
blank screen appear!!!

Same thing in vqadmin when i clic show users :

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request

and on the logs :
[Thu May 25 13:59:46 2006] [error] [client XXX.XXX.XXX.XXX] Premature end of script headers: /usr/local/apache/cgi-bin/vqadmin/vqadmin.cgi
151.42.214.26 - admin [25/May/2006:13:59:46 +0200] "POST /cgi-bin/vqadmin/vqadmin.cgi HTTP/1.1" 500 621

My apache is configured with :
 ScriptAlias /cgi-bin/ "/usr/local/apache/cgi-bin/"
 <Directory "/usr/local/apache/cgi-bin">
        AllowOverride All
        Options ExecCGI
        Order allow,deny
        Allow from all
    </Directory>

and

#Settaggi per vqadmin
<Directory "/usr/local/apache/cgi-bin/vqadmin">
deny from all
Options ExecCGI
#AllowOverride AuthConfig
AllowOverride All
Order deny,allow
</Directory>

File system privileges :

-rwsr-sr-x    1 vpopmail vchkpw     317632 mag 25 11:41 qmailadmin
drwxr-xr-x    3 vpopmail vchkpw       4096 mag 23 21:27 vqadmin

and vqadmin dir :

drwxr-xr-x    2 vpopmail vchkpw       4096 mag 23 21:23 html
-rw-r--r--    1 vpopmail vchkpw        864 mag 23 21:23 vqadmin.acl
-rwsr-sr-x    1 root     root       274576 mag 23 21:23 vqadmin.cgi

All the rest function of qmailadmin and vqadmin works great !!!
Tried also with qmailadmin 1.2.9, but the results is the same.

Please help me.
Thanks in advice
Dario Cdj