Are you getting error messages like

Warning: session_start(): Cannot send session cache limiter - headers already sent 
(output started at /public_html/admin/simpleinvoices/config/config.php:1) 
in /public_html/admin/simpleinvoices/login.php on line 19

or

Warning: Cannot modify header information - headers already sent by 
(output started at /public_html/admin/simpleinvoices/config/config.php:1) 
in /public_html/admin/simpleinvoices/insert_action.php on line 162

The main cause of these errors is caused when authentification is enabled in Simple Invoices. This error occurs on about 80% of the pages in Simple Invoices and will be fixed in the January 2007 release of Simple Invoices

There is currently no work-around for this issue, your options are either:

• disable authentification
• use an alternate form of authentification
  • try using Apaches .htpasswd to restrict access to the directory
    • refer http://www.euronet.nl/~arnow/htpasswd/documentation.html
• wait for the January release of Simple Invocies

For more information refer: http://simpleinvoices.org/forum/topic.php?id=45

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