Bomb Explosion Bug?

[ScooterDog]

Recently got the game and started playing Scenario 1. Restarted Scenario 1 earlier today and the combat animation pop box has a problem - bomb explosions on ships, the water and airfield (nothing else is a problem) were each little square boxes with two smaller boxes inside. Restarted the computer and game and it is still a problem. Nothing major just annoying.

Thank you for your help.