Edit: I guess Howard posted while I was composing. I agree, if the forum software is about to change, no sense even looking into this.
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I'm not 100% sure what the OP meant, but the symbol I was referring to shows up on all threads that have been updated (since I last clicked "New Posts," I believe). I get a list - oftentimes pages long - whenever I click on "New Posts" which is in the banner line just below my user-name at the top of the forum. This line has, from left to right: "Forum Home" "New Features" "New Posts" "Community" etc.
(Note that the same symbol is used for the same purpose in "New Posts, subset "My threads," but the behavior I am referring to happens in "New Posts" general (all threads).
Here is what I mean:
Now, I oftentimes don't close out of SB. I just leave it open in a tab while I'm doing other things. Then when I come back to the SB tab, I will click on "New Posts" to "re-set" the chevron symbols.
The behavior I thought the OP was referring to was something that suddenly seemed to work a bit differently, in that I would hit "New Posts," the chevrons would be updated (new threads would move to the top of the list, etc.), and yet if I clicked on the chevron to a thread with many new posts -- one that I had visited already that day -- it seemed like I would continually be taken to the post that was new at the beginning of the day. Even if I went away for awhile and came back and re-did "New Posts", and then clicked the chevron again, I would be taken back to that "original" new post in the thread (which might not even be on the last page of a thread).
^^^ Ugh, sorry, that looks confusing but it's hard to describe succinctly.
At some point, the chevron "works" again; I'm just not sure when exactly. Maybe after I have been away for X hours? After my computer has "slept"? I don't know.
And... it's not a big deal. I can easily live with it (I just start hitting "last page of thread" when it happens and then scroll - instead of using the chevron). I only mentioned it because it seemed like I had noticed it as a new thing, and right about that time the OP posted this thread. I'm quite appreciative of the board, the moderators, and the other contributing members
Blue Sparkle