I have played for while now, and have discovered that the Campaign map won't scroll south. I can just barely get inside Zürich, but the screen will not show me anything south of that city.

I have tried clicking on the edge of the screen, clicking and holding, and using the arrow keys. I always reach the bottom edge of the screen and cannot proceed any further south.

Any advice would be appreciated.

Zurich is literally at the very bottom of the game map. I don't think you can go south from there.

@Pixel_Forest... @Yaab1 is correct. You can't really proceed south of Zurich on the in-game map in any practical way. Two other cities similarly situated along the far southern edge are Graz more toward the far eastern edge of the map, and Kufstein situated about halfway between the two. Graz, infact, is so on the southern edge of the map it can be abit tricky to ingress/egress, and can sometimes become a somewhat frustrating pixel hunt trying to find your way.

Hope that helps. Cheers!