Steps I followed:

create mysql database and user

grant ALL to user on new database

upload contents of "upload" dir to "support" subdirectory of my site

chmod 777 ostconfig.php

browse to http:///support/setup/index.php

fill out form with admin user info, system email, and DB connection info

Submit

Here's what I got:

Firefox opens the file download dialog for saving "index.php" (which, when saved or opened is completely empty).

Database is seemingly populated with appropriate tables:

mysql> show tables;

+-------------------------------+

| Tables_in_production_osticket |

+-------------------------------+

| ost_config |

| ost_department |

| ost_email |

| ost_email_banlist |

| ost_email_pop3 |

| ost_email_template |

| ost_groups |

| ost_help_topic |

| ost_kb_premade |

| ost_staff |

| ost_ticket |

| ost_ticket_attachment |

| ost_ticket_lock |

| ost_ticket_message |

| ost_ticket_note |

| ost_ticket_priority |

| ost_ticket_response |

| ost_timezone |

+-------------------------------+

18 rows in set (0.00 sec)

the ost_staff table is empty (i.e. the admin user wasn't created)

mysql> select * from ost_staff;

Empty set (0.00 sec)

Apache access logs show initial GET on the setup/index.php page, but no subsequent POST.

Apache error logs do not contain anything.

Reloading http:///support/setup/index.php results in "Configuration file already modified!" error message (and the config file does, in fact, appear to be properly populated)

I'm not a PHP programmer, so I don't know where to go from here to investigate. Ideas?

Using PHP5, Mysql 4.1, and Apache 2

short_open_tag is set to On in /etc/php.ini