I don't know if this is a bug or a feature.
IIRC, on the old board, when you clicked on a link, it opened in a new window (or tab) as the default. On this one, it goes to the linked page in the window you are currently in, which I find annoying. I know I can right click and pick open in new tab or window, but I keep forgetting.
I don't think it is something with my browser, since other places work different (like CQ, though that isn't using phpbb).
Not a big deal, and maybe others like it this way, though I thought I'd mention it.
Thanks,