// Plugin by <a href="http://wordpress.org/extend/pl.....&quot; rel="nofollow">http://wordpress.org/extend/pl.....-redirect/</a&gt;
// Solution by <a href="http://www.dominornovus.com&quot;

function login_widget_redirect( $empty, $redirect_to, $requested_redirect_to, $user )
{
// If the referring page contains "/forums/"...
if (stripos($_SERVER['HTTP_REFERER'],'/forums/') !== false)
{
$referringpage = $_SERVER[HTTP_REFERER];
return $referringpage;
}
//Otherwise, check the referring page contains "/blog/"...
else if (stripos($_SERVER['HTTP_REFERER'],'/blog/') !== false)
{
$referringpage = $_SERVER[HTTP_REFERER];
return $referringpage;
}
// Otherwise, default to the plugin's redirect settings...
else
{
return false;
}

}

add_filter( 'rul_before_user', 'login_widget_redirect', 10, 4 );