[PHP] Cannot add header information - headers already sent by

[Tom Nickels]

Hi everybody!

I installed php 4.06 on Win NT, IIS 4. Before I updated php 4.00 with 4.06 my scripts 
were running fine. Since the update I am getting always the follwoing error:

Warning: Cannot add header information - headers already sent by (output started at 
lang/dt/variables.php:321) in ............vote_submit.php on line 34

Line 34 is:

header("Location: ".$source."?status=9&errormessage=$errormessage");      

Any idea, why this is after update not working anymore? Thanks for help

Tom