Have you mapped out which of the new factions will get what troops throughout the game? And have you set up the tech-tree for building the VI-specific troops in Early?

-- Yes, and it seems to be going okay, as I have assigned troops to different factions other than Vikings and tested.

Your dismount problem might be a faction thing, I think you need to set the faction availability of Early(Royal)FootKnights, which dismounted DarkAge(Royal)Knights turn in to.

-- Considered that, too. Will experiment later with this one. Thank you for your thought.

I assume you have copied/modified all faction-specific lines from Viking.txt to VikingInc.txt: GGConquestReward, SetFactionMusic, SetActiveFaction, SetTreasury, SetReligion, SetCulture, SetBehaviour, SetFactionCol, SetRegionOwner (for at least 1 province), AddOffice (for the MTW buildings, not VI), and PlaceLeader. I'm pretty sure you need these or the campaign will CTD.

-- All except "add title"; I thought I could do that later. But I will put those commands in there for them and see what happens.

Small bit of advice, try to get 1 faction working completely before adding the others. It will make it easier to hunt down the problems and will make adding the later ones a breeze. Fortunately you can just comment out lines in the startpos file. Faction declaration order in the startpos file (VikingInc.txt) does matter, getting the names.txt and faction_specific text stuff correct depends on this order.

-- Wilco.

Can't help with the shield thing (or any kind of graphical stuff) at the moment, I've only got access to the basic txt files on my work PC.

-- Okay.

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I will do the AddTitle and see if that changes anything. Thank you for your efforts.