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As reported by [http://forum.joomla.org/memberlist.php?mode=viewprofile&u=185541  auciker], because of a change made to improve security, login with redirection will not work for PHP 4 sites. This may also impact other areas where there is redirection, specifically polls and mailto.

To fix this:

*  Add this to the end of /libraries/joomla/utilities/compat/php50x.php 
<source lang="php">
if (!function_exists( 'stripos' )) {
    function stripos( $haystack, $needle, $offset = 0 ) {
        return strpos( strtolower( $haystack ), strtolower( $needle ), $offset );
    }
}
</source>
* OR - Upgrade to PHP 5. PHP 4 end of life was August 8, 2008. There will not be any more PHP 4 releases, even for security.    (Switching PHP versions may cause problems with some 3rd Party Plugins - be sure to test thoroughly).
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