Steve-
You were certainly right about Precursors in 2.0.
Precursors in 2.0 generate a single non-program ending error (3065? I forget but it's no big deal...I'll check for it and edit this post later) each time incriment until the Precursors are destroyed. They will not fire at any ships/colonies or chase them but *will* shoot at incoming missiles. At least, the Precursors set up with some weapons in point defense mode will.
Probably, the error is crippling the Precursors and making them just sit there. I did not ever see the endless-loop error from 1.9, probably because the Precursors did not shoot at my fleet.
While I have a hunch that when you finally get around to fixing the Precursors they will have completely different ships, for now if anyone wants to safely beat on some relic warships with their own warfleet, make some. Heh.
"Shhhh...be vewy, vewy quwiet. We're hwunting Precursors! Heheheheheheh!" --E. Fudd, Precursor (and Wabbit) Hunter
HD