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The little tick-mark at the left of a thread title is supposed to take you to the first unread message. This used to work perfectly on my system ( XP sp2 + firefox) prior to the latest site upgrade. Unfortunately, it now takes me to the last post in the thread which, in an active thread, results in much scrolling in order to locate the correct part of the thread.
In the grand scheme of things this is merely a minor irritant but if anyone knows how to restore the correct functionality i would be most obliged.
I have tried deleting all the Pprune cookies but it had no effect.