Mission 4 , it's not buged but this last mission should have little fix with A/gun AI, sometimes all 8 a/gun attack one target, sometimes they fire too much torpedos at main target and mission failed .Maybe change their enter points (from hyperspace ) when shuttle exit targets hangar they will just disable shuttle.I play this mission around ten times enough for me:) .

My Rating For First Mission is less than ZERO I even dont complete first mission I dont like this missions when we have to destroy all 100% of enemy fighters and IF ANY escape mission is failed I dont have time to fly 20 times to complete one mission