[falko]

It's working for me:

[21] => checkboxField Object
                (
                    [value] => 
                    [css_class] => 
                    [name] => web_python
                    [type] => checkboxField
                    [title] => Python
                    [language] => de
                    [description] => 
                    [length] => 30
                    [visible] => 1
                    [required] => 0
                    [reg_expression] => 
                    [reg_fehler] => 
                    [search] => 
                )

            [22] => checkboxField Object
                (
                    [value] => 
                    [css_class] => 
                    [name] => web_ssi
                    [type] => checkboxField
                    [title] => SSI
                    [language] => de
                    [description] => 
                    [length] => 30
                    [visible] => 1
                    [required] => 0
                    [reg_expression] => 
                    [reg_fehler] => 
                    [search] => 
                )

            [23] => checkboxField Object
                (
                    [value] => 
                    [css_class] => 
                    [name] => web_ftp
                    [type] => checkboxField
                    [title] => FTP Zugang
                    [language] => de
                    [description] => 
                    [length] => 30
                    [visible] => 1
                    [required] => 0
                    [reg_expression] => 
                    [reg_fehler] => 
                    [search] => 
                )

            [24] => checkboxField Object
                (
                    [value] => 
                    [css_class] => 
                    [name] => web_frontpage
                    [type] => checkboxField
                    [title] => Frontpage
                    [language] => de
                    [description] => 
                    [length] => 30
                    [visible] => 1
                    [required] => 0
                    [reg_expression] => 
                    [reg_fehler] => 
                    [search] => 
                )

            [25] => checkboxField Object
                (
                    [value] => 
                    [css_class] => 
                    [name] => web_mysql
                    [type] => checkboxField
                    [title] => MySQL
                    [language] => de
                    [description] => 
                    [length] => 30
                    [visible] => 1
                    [required] => 0
                    [reg_expression] => 
                    [reg_fehler] => 
                    [search] => 
                )

Is it possible that you use an old version of lib/classes/ispconfig_isp_web.lib.php?