@strategy
what i meant with my post before was
-every city seems to have a fix limit of buildings say 30 . if you build a 31st building then the scripts will kick in and delete 5 older buildings randomly.
-again, the new resource wonders you added (filling,rubber planet etc) do not behave like the other national wonders ... say u build Hermitage in city x , normally it disappears from the list of buildings in other cities , well , your new nationals (rubber,aluminium etc) are not behaving this way ... you build them in city x , then you CAN build them again in city Y , but when you do city x gets a plague or some script error that deletes randomly 5 other buildings.
-3rd problem is upgradeable buildings : harbor-port-com port-int port for example ... say its year 1990 ingame , you take a pioneer and build a city - it comes with many buildings including lets say a port , then you build a harbour (because you can , its in the list and its says you will get some bonus) , then you can build international port , and then you can build commercial port too..
see , its a messed up tree , old buildings should transform in new ones and delete the option to rebuild said building from the list.
-granary also has problems in the way : say city x has a granary , you build the modern one , now the city has both in its building list , then you build food plant , and then surprise , you can build granary again .... but if you do .. then modern granary and food plant disappear.
well , its only a problem if you play on a tight timetable, eventually i keep rebuilding my buildings many many times untill they stick ... that's of course because i can build units from one single city that makes them 1 per turn... and after in build world bank i start making 20k gold per turn , so i can buy up disappearing buildings faster than they disappear ...