The 'frozen impulse trail' from the Breen engines is not coming out reliably. When it comes out at all it comes out one side only, and oftentimes it doesn't show at all. It's taking a visuals slot to show that even if not equipped to the ship, please fix it so it does?
Edit: Nevermind, it's just related to that other problem where visuals don't always show right and require resetting the game to fix.