So I know the -ne and changing screen display to 1024x768 trick to avoid crashes, but now the problem goes to the new units.
I have only tested some out in custom battle and don't know how they play into the grand campaign, but it looks like the stats for many of them use EB 2 style stats, which many vets would know are completely different from that of EB 1 on the Rome 1 engine. So some of the units having only say, 2 morale, would make them very susceptible to instant routs considering that even the crappiest of EB 1 units don't go below 8 morale (IIRC).
Also with the Kestrosphendonetai and Gastrephetai Hellenikoi, is the AI limited on their ability to recruit these? They seem ridiculously OP, able to utterly destroy many units from the front.