Ive had this happen to me 2 times since beta started. Ill be fighting a enemy ship and no weapons will fire. I don't really know what else to add to this other than it seems pretty rare and I was in a instance alone.
However everything else seems to work like equalization of shields and other special non attacking moves.
Both times this happened I had multiple NPC's attacking me I tryed targeting different ships still the ship wouldn't fire. The last time this happened I ran away for around 5 minutes while filling out a bug report and when I was finished I could fire again.