Can you please post a screen capture?
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I saw something like that recently. It was when we compiled a merge setup and did not change from the old way of redirecting a topic to another way of doing it to keep FF happy. Unfortunately I don't still have a copy of that.
Is it merged help you are working with?
Other than that, I don't know what could be causing the problem.
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Thanks for the information. It is not a merged file though.