Hmm, I always play under BI from the start so I'm not sure...
Did you do the things like making a copy of the "imperial_campaign" folder in EB\Data\world\maps\campaign and renaming it into "barbarian_invasion" ? And whatwastheotherthing... copying "imperial_campaign_regions_and_settlement_names.txt" in EB\Data\text and renaming it "barbarian_invasion_regions_and_settlement_names.txt" ? IIRC you could get issues if you didn't do those bits.