Hmm, this thread looks like it's had quite a few replies yet it is the first time I have seen it. This has been a constant frustration of mine and one that has kinda put me off strats that involve early game air. For instance, of you go second air and then tell the bomber to stop before the enemy's base, select a radar blip that looks like an engineer and often, the bomber will just fly over the target without dropping a bomb, giving away your element of surprise and giving the enemy perfect intelligence that you have gone second air and that they can therefore send units to your expansions. Funny how when I posted about it people cried "n00b, you need to micro more", only now is it recognised as a bug