If it's not launching fighters at all, check to see if the weapons/outfits are all pointing to the correct resources. The weapon's 'AmmoType' should be the RID of the fighter's Ship resource.
If it is launching fighters, but not throwing them at you, it's an AI bug/feature. After taking a certain amount of damage, I've seen carriers set their fighters to 'Defense.' The thinking is probably that an enemy would have expended its ammunitioned long-range weapons early in the fight, and need to close in for the kill.
If it is holding its fighters back for this, you could put simple point defense turrets on the fighters, and they'll try to shoot at any missiles headed for the carrier. (The formations used in Nova hobble this though, with the Carrier at the foremost point, and the fighters behind in a 'V' formation. Any fighter-based Point Defenses would have to have a longer range than the size of their carrier just to have a chance of being helpful.)
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This post has been edited by Eugene Chin : 18 July 2007 - 06:35 PM