@Parrot - how did you run it in admin mode?
@Black - to test this I copied my modded coreunits.xml from mods and moved it into english folder. I then deleted the mods coreunits.xml, loaded the game up, and my changes aren't showing. Sounds like I need to get this admin mode thing nailed down.
[Edit] Ok, thanks. Figured it out. Admin mode worked for me too, yay!