Caesar 3 bugs
Julius recreates many bugs that you can find in original Caesar 3 game, to preserve 100% saves compatibility. This is an incomplete list of those bugs and some gameplay idiosyncrasies that you can encounter during the gameplay.
Each building in Caesar 3 is assigned to only one road network. That can result in a situation where a warehouseman cannot reach a given warehouse just because the warehouse has been assigned to another network than the building that's sending a warehouseman (see the image below). To avoid this problem make sure that all your warehouses are adjacent to only one road network.
Gardens split roads into separate road networks. Even though market trader can use garden tiles as road tiles and pass by a given warehouse, that warehouse (even if full) might be ignored if it's assigned to another road network than market building (each building is assigned to a single road network in Caesar 3). To avoid this problem make sure that market traders traverse your city via road tiles rather than gardens.
In original Caesar 3 game, market trader can get food only from granaries, never from warehouses (even though market traders get resources from a warehouse, such as pottery).
If you have one dock and are trading with two cities, it is possible that (1) you will get paid for a few more units of goods in the year than are allowed from the city buying them, (2) that a couple units of goods will show up as being loaded onto a ship from a city that does not trade those goods, and (3) because of the mistakenly loaded goods, that ship will fail to purchase a couple of loads of goods for which it has room and for which you have goods available. More details are available in this comment.
For a more comprehensive list of original bugs, along with their current status, please check the original bug issue reports.