Question about keeping track of read/unread

I’ve been trying to use the read/unread feature of to keep track of what I’ve seen and not seen. I do the following. I go to the forums page and I see which forums are marked. I do an open in new window from my browser, and I see marked topics. I read the topics, and exit this window. When I repeat this, all topics are marked read? Am I doing something wrong?

nothing wrong.
Just a “feature” of the free phpbb forum software.

Ok, is there any way to get it to do the “right” thing?

Let’s hope future releases of phpbb can make this work properly.