Could be the double </if> at the end?
If that still doesn't work, try building it up slowly until it fails ...
<if condition="$post[postcount]==1> should show after the first post in all forums
<if condition="$post[postcount]==1 and $foruminfo['forumid'] != 69"> should show after the first post in all BUT forum 69
<if condition="($post[postcount]==1 or $post[islastshown])"> should show after the first and last post in all forums
<if condition="($post[postcount]==1 or $post[islastshown]) and $foruminfo['forumid'] != 69"> should show after the first and last post in all BUT forum 69
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