Problem on Debian 7 Install

Hi guys,

I downloaded the last file of katak on new Debian 7 System:

root@ns1:/var/www# cd /var/www/
root@ns1:/var/www# wget http://www.katak-support.com/sites/default/files/downloads/katak%20ver%2...
root@ns1:/var/www# unzip katak\ ver\ 1.0.0.zip

root@ns1:/var/www# ls -l
total 788
-rw-r--r-- 1 root root 177 Aug 2 11:56 index.html
drwxr-xr-x 10 root root 4096 Nov 29 2013 Katak-1.0.0
-rw-r--r-- 1 root root 797291 Nov 29 2013 katak ver 1.0.0.zip
root@ns1:/var/www#

After, the database has created with:
mysql> create database katak;
mysql> grant all privileges ON katak.* to katak@localhost identified by 'secretpassword';
mysql> flush privileges;

After, the ktk-config.php as moved and setted permissions:
cd Katak-1.0.0/include/
mv ktk-config.sample.php ktk-config.php
chmod 777 ktk-config.php

On Firefox (in my desktop, a Debian 6 with Firefox 24.7.0), i oppend the URL of server:
http://192.168.1.28/Katak-1.0.0/setup/

I complete the informations (mails, database name, password etc), but after pressed "Install", only a blank page is displayed.
In /etc/php5/apache2/php.ini, the "short_open_tag" is enabled.

Is there anything else I can check?

Thanks!