Most of the time when I start the game I can't get beyond the main menu of it. As soon as I click any of the buttons it crashes.
Sometimes the menu does work, but when I start a game the geoscape doesn't show up. All I get is a black screen with the words (loading geoscape) on it that doesn't go away no matter how long I wait.
EDIT: I reinstalled the game. The issue has been solved.