Hi Mike,
This occurs, the first time, you connect to nfsen with no valid browser session.
In order to permanently fix this you may apply the patch below:

--- html/nfsen.php.orig Tue Jan 24 19:12:33 2012
+++ html/nfsen.php      Fri Jan 27 10:17:16 2012
@@ -42,7 +42,7 @@
 $expected_version = "1.3.6p1";

 // Session check
-if ( !array_key_exists('backend_version', $_SESSION ) || 
$_SESSION['backend_version'] !=  $expected_version ) {
+if ( array_key_exists('backend_version', $_SESSION ) && 
$_SESSION['backend_version'] !=  $expected_version ) {
        session_destroy();
        session_start();
        $_SESSION['version'] = $expected_version;


        - Peter


On 1/26/12 19:02, Lang, Michael wrote:
> Hello,
> 
>  
> 
> I upgraded to 1.3.6p1 and there is an extra line of code in the new version 
> that now prints the following the first time
> I connect to the interface:
> 
>  
> 
> Frontend - Backend version missmatch!
> 
>  
> 
> Warning: Cannot modify header information - headers already sent by (output 
> started at /var/www/nfsen/nfsen.php:49) in
> /var/www/nfsen/nfsen.php on line 78
> 
>  
> 
>  
> 
> I assume this was happening before just not getting a message about it.  I’m 
> not sure what to fix – can someone lead me
> in the right direction?
> 
>  
> 
> -          Mike
> 
> 
> 
> This body part will be downloaded on demand.
> 
> 
> 
> This body part will be downloaded on demand.

-- 
--
Be nice to your netflow data

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