Updating to 3.09 didn't help either.

dcz wrote:Ok, I see, try to add the same code once more before the first :

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      redirect(append_sid("{$phpbb_root_path}viewtopic.$phpEx", "t=$topic_id" . (($forum_id) ? "&f=$forum_id" : '')));

this means, in addition to the previous code changes, add again :

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// www.phpBB-SEO.com SEO TOOLKIT BEGIN
if (!empty($phpbb_seo->seo_opt['zero_dupe']['on'])) {
        $phpbb_seo->seo_redirect($phpbb_seo->seo_path['phpbb_urlR']);
}
// www.phpBB-SEO.com SEO TOOLKIT END

Before the first occurrence of :

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      redirect(append_sid("{$phpbb_root_path}viewtopic.$phpEx", "t=$topic_id" . (($forum_id) ? "&f=$forum_id" : '')));

It's the call to redirect to cause the 302 header.

This did the trick, thanks a bunch!

Edit *solved*, can be deleted.