I'm having several issues with beta 4.

First are video issues. The main one once i installed that last update, all my custom mages lost their heads. I think that is what start causeing the constant crashes in in the game after that point. So I started a new game (several actually) with a new custom mage. The first time I reloaded the game that mages head was gone as well.

Sevearl other random video issues. When archer or mage groups fire a volley, first the missles streak across the screen from the unit, then several streak in from of left side of the screen. 

Sometimes when I load a save game the fraction borders are not visible. I have to exit FE entirely and then they will return.

Some units travel invisibly around the map. I have had several times when I moved to a square and there were units there that were not shown. Sometimes this is when the units are stacked. Sometimes it's when they are solo.

I have also had units that traveled between the lines. They seem to stand on the X between four squares and you can't attack them as they are not actually on any of the squares that they touch. Side note: saveing your game when that is visible will courrupt it. Not sure that is related or not.

Still some slowdowns in combat as the system waits for random animations to complete.

Units taking a dive on counter attacks?  When a unit attacks someone with a counter attack ability the unit members drop dead first, then the counter attack animation happens to explain why the units just dropped dead.

Initive system not working correctly. Some units get five or six turns in combat before other units get any.

When you cast a slow spell on a unit (specificly but not limited to archers) they will just stand there for the entrie combat with out ever getting a chance to act. 

If a unit has slow cast on it,  and then has haste cast on it, shouldn't those two spells cancel out? They don't. You now have a slow hasted unit.  Who usually neverr gets to act.

Changing defenses? Units from milita to sov's are randomly changing their defensive and offensive values during combat. I'm guessing it is by design but I don't know what the causes of it are.  milita defense will sometimes (not always) randomly change within the course of one turn from 0 to 15 to 10 to 8. When there are fewer members in the unit the defense value usually goes up?

Again I suspect that there is somekind of logic behind why that happens but it is not readily visible to me while i'm playing so it makes me think there is an issue.

Those are a few of the issues i'm having with the game. I'll not go into the game play issues I have as those are a matter of preferences. Surfice to say since that last update I have not gotten to play a game into the 200 turn range as the changes to game play have killed or bottled up my faction with in the first 50 to 100 turns.   Not loving the direction this game is headed.