I had the same problem, but found that simply hitting the space key a number of times after entering the reg code did the trick.

I'd like to have a way to turn the tooltip display on/off. I find it especially distracting when trying to watch a turn unfold to have the mouse activate a regional tooltip display. I try to place the mouse in a "neutral" area when ending a turn, but after closing down a battle report screen, I can'...