I've been doing a lot of reading on this issue and the change was very deliberate by the PHPBB community. From what I understand, the old behavior (popping up new windows) went against the strict XHTML standards. They changed it to inline links to make it validate properly against the current standards.
There are mods available in order to restore the old behavior. However, it requires hacking some of the underlying files. I'm perfectly comfortable doing this, but I don't have access to the actual machine in order to do the changes and to be quite honest, I'm a little leery about asking B3 to put in a ticket for it because if someone isn't careful, it could wreck things.
I'm still working on coming up with a solution to move the board to a different hosting provider where I can have access to the stuff that I need in order to be more responsive to stuff like this. It's slow going though and not any guarantee if it will happen.
In the meantime, I'm sorry, but you'll all just have to live with the new behavior and train yourselves to right click on links for now.
-- Gary F.