Hi. I think I got this right, but I just wanted to make sure (as I am going to re-play BG2 after my Underdark save):

With ToB installed, you can finish BG2, go to your new keep, and still play Watcher's Keep. It is only when you start the new storyline (the 'add-in') for ToB that you cannot return to the BG2 worldmap (with the newly added Watcher's Keep)?

Thanks,

Devlish

Watcher's Keep is supposed to be on both the SoA and the ToB world maps.