The picture will show you what I mean:

This happens as soon as a ship gets hit by torpedo or gun.
Also it seems to happen only to
Vanilla and U-Boat Missions Unit. Ships that come with mods like OM are not effected by this.
My GPU is a Radeon 5670. I tried different drivers and also different graphic settings (ingame and in Catalys Control Center). But nothing works.
Any solutions?