As description above suggest's I have been running into a bug when I try and assault settlements. After attacking the settlement and then clicking the 'assault' button the battle window where you chose to 'auto/manual fight/retreat' is not appearing. Along with this issue I then have to end the program via task manager as I am unable to click anything else within the game.
I know this Mod has only been updated so assume could just be a bug that needs ironing out? I have been able to get round this so far by either reloading and attacking a turn later or when that hasn't worked reloading and attacking another settlement. (via this second method I was in the same turn able to go and attack and conquer the previously unresolvable settlement)
As per above I can work around this so this just an FYI.
Really enjoying this updated mod!