It won't show if there are no new threads to view, such as if you just clicked Mark Forums Read.
What I suspect though, is that you have another product that uses the same template hook and it's interfering with it.
Do you have any other products that place anything at the top of the showthread page? If so I can probably help you fix the problem.
But maybe there's something changed in vB4.1.8, I haven't upgraded to that yet.
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