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JoshPet said:Look at any files which get included or echoed above that.

It's what's above that in the script that might be causing trouble. [/]
OK, so here's what is above the authentication in my login script:
<br /><?<br />// --------------------------------<br />// define some stuff<br /> $spacer = " ";<br /> $loginboxsize = "10";<br /><br />// --------------------------------<br />// require the language file<br /> require "$path/languages/$w3t_language/login.php";<br /><br />// --------------------------------<br />// authenticate visitor<br /> $userob = new user;<br /> $user = $userob -> authenticate("U_Username,U_Privates,U_Number");<br /> list($Username,$Privates,$Number) = $user;<br />Note that $path is defined in my main index.php which calls my login script like this:
<br /> <?php include "minilogin.php"; ?><br />
At first I thought that the white space before the <?php above was causing the error, but even when I remove it the error remains.
Do you see anything here that's likely to be the cause?