Thank you for the reply. It turns out that I had not used the 4gb patch on the .exe. Once this was done, the game began working as expected.
However!
Why won't my periscope stay where I put it??
Sometimes, I'm trying to raise the scope, and it's not going up! It goes up a little, then comes down!
I ran a patrol today, sank 15 ships! That was even before I got too my patrol grid, I actually had to turn around and go back due to lack of ammo, and partially, because the periscope was allied with the English!