What is this pop up?

Not a clue!

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That shows you all the unread posts on a thread you have followed. Click on it and it will go to the next unread post.

Sometimes the board thinks you have not read posts you have read so it is not perfect, but that is what it is meant to do.

Thanks. The wording is terrible, very confusing if one hasnt seen it before.

Remember this is an international forum. Pekka is the programmer who likely worded that. He lives in Finland and "American" English is probably not his primary language.

He seems to like to add a personal touch to the forum. The use of unusual wording let's you know a real person with a personality all his own created this board. To me that is better than outsourcing it to a bunch of coders who are doing it just to get a pay check.

Did you click on the link in the pop up ('"unseen traversal", huh?')?

N.V.M. wrote in post #18226659
Thanks. The wording is terrible, very confusing if one hasnt seen it before.

I agree. From my read it gave the impression that you might have tapped into some secret hacking mode.