Bug: Aircraft Unavailability in Battle Mode

[sammy1339]

Whenever I go into battle mode and buy units, it seems that there is a certain number X, between 1 and 10, such that:

- After I buy X combat aircraft formations (including attack helicopters and strike elements, but not utility, heavy lift, or scout helicopters) all aircraft (including utility, heavy lift, and scout helicopters) disappear from the formations list.

- If I delete any combat aircraft formations, the unavailable units become available again - but they disappear again if I purchase any number of combat aircraft formations totaling X.

X changes every time I start a battle.

Furthermore, if I buy any aircraft at all, including utility/heavy lift/scout helicopters, all aircraft become unavailable to the second player (they are unavailable if I set the second player's purchase to "human" and the AI apparently won't buy them either).

I have had this bug on two separate computers, one running Win98 and one running Vista.

Thanks if you can help.