Strange behavior - output_buffering

Hi, I can't get "output_buffering" to work. It's turned on in PHP.INI, but it doesn't matter if is ON or OFF. The behavior is always the same. If I use the header() function after sending output, there's a warning telling that you cannot send headers after data, and the page stops processing. I've used this option from the beginning of PHP4 and I don't know why it stopped now. I'm using RedHat 6.1 with Apache 1.3.9 and PHP4 as a DSO module. May be something related to the recent changes of [Session] attributes in PHP.INI ? Thanks in advance, Giancarlo Bonansea Technology Consultant TESEtec Tecnologia e Solucoes Educacionais Ltda. Sao Paulo - SP - Brazil TEL +55-11-5182-2155 R.204 FAX +55-11-5182-9823