If your server utilizes Suhosin to hardened the PHP, such as ubuntu LAMP stack package, you will need to increase the maximum Post and other variable in order for SigmaOne configuration forms to work as expected.
Increasing value via php.ini file
You can append these lines into php.ini file and restart apache server afterwards
suhosin.post.max_vars = 2000
suhosin.request.max_vars = 2000
Increasing value via .htaccess file
Alternatively, you can append these lines to Drupal standard .htaccess file
# PHP 5, Apache 1 and 2.
<IfModule mod_php5.c>
php_flag magic_quotes_gpc off
php_flag magic_quotes_sybase off
php_flag register_globals off
php_flag session.auto_start off
php_value mbstring.http_input pass
php_value mbstring.http_output pass
php_flag mbstring.encoding_translation off
# Append this line
php_value suhosin.get.max_vars 2000
php_value suhosin.post.max_vars 2000
php_value suhosin.request.max_vars 2000
</IfModule>
No need to restart apache server if you increase the value via .htaccess file
