Point Defense canon question...

[Seawolf]

OK here it is, you have to remember that there is 2 "phases" to a turn in combat. Each player has a phase each. PDC can only fire once per turn not phase. So what I guess is happening is that the PDC fired during your phase and the missiles moved during the enemy phase. Since the PDC couldn't fire the second time it didn't.
As far as showing ready, that may be a glitch in programming. See if what I described is what actually happening.

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Seawolf on the prowl