I've noticed a couple of things in a recent game using version .51 that I have not seen mentioned yet.
First, Ascian. You can equip Ascian with helmets and his graphic looks completely messed up. Also, I suggest that you bump up his movement to at least 3. He's a "panther" or something like it, so he should be able to move faster than 2. Also, he can't ride mounts, so he should have a speed bump to help him move with the rest of your army.
Second, the rain of arrows animation takes forever to resolve. The first time I used it I thought the game had froze.
Third, in a recent game I noticed that one of my pioneers got stuck on a river tile. There was no way to move the unit. Reloading to an earlier save fixed the issue.