I have to run, but one request...
When you point to the "Mark Forums Read" link, what URL do you see? (I know it should show in the bottom left on the IE browser).
Something like... http://www.tsptalk.com/mb/forumdisplay.php?do=markread&markreadhash=13645741 59-80cbeaad1f562e7de0f571dc56ea5b9a4937cc2a
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