i have modded the export_descr_building.txt by simply adding to new buildings.
i have touched nothing else.and for some strange reasons i can't build the core_buildings upgrades(means that if a city gets the numebrs of civilians to became a large one i can't build proconsol_palace ).All works perfectly on other game aspetcs,meaning no other strange behavior.

here it is:
http://www.totalwar.org/Downloads/Rt...gs_erroneo.txt

hope someone will find anything wrong.

the best part is that the back up copy works perfectly...

i have added in this file those new buildings:

clearance
naval_architect
safe_sea
war_port
hinterland_mines_gold
hinterland_mines_silver
hinterland_mines_copper

i can't understand why they influence the core buildings ....