Love the game, played it a few years ago.

What is happening is when party member 1 kills an enemy, I tell party member 2 to attack the same enemy before it dies. This results in party member 2 attacking a dead enemy (or nothing) and crashes the game.

So...if party member 2 gets the order to attack the enemy while it's dying, the game crashes.
If party member 2 gets the order before the enemy dies, the attack is canceled.
If party member 2 is told to attack the enemy after it dies, nothing happens.

I have a feeling there's nothing to do and I just have to let those enemies get a few hits in while I figure out the number of the enemy that died (or basically I have to wait for the corpse to disappear before I dare to attack with someone else). Major lameness. But still - I haven't heard of anyone else with this problem. I read the patch notes and they don't mention this.

:(

Also, it seems like for the first enemy I can just hit enter (or space) to attack, but with the next enemies I have to select their numbers before I can attack them. Jeez. Why, just why.

I have this problem as well. Waiting for the corpse to disappear is the only option. Looks like they didn't test it for this situation.
Also when fighting final boss make sure you don't move your character on sphere ball place while enemy is respawning them. It will freeze game.