Defense buildings don't seem to work beyond line of sight.

[Darxus]

I can see the enemy on the radar, and I have a targeting facility built. The only ones I've tested are Ambushers and Berthas. They not only refuse to pay any attention to anything on the radar on their own, but they won't fire even when specifically told to. Until the enemy comes within line of sight, then they act appropriately.

Spring lobby v. 0.0.1.10136. Balanced Annihilation v6.31. Running under Ubuntu Linux. The berthas were using .cheat + .nocost, the ambushers weren't.

Yes I'm checking the range with the ground defense circle thingies.