Millenaire has a bug that causes villagers to become stuck and spamming your chat when chunks are unloaded. If you ever enter a Millenaire village and the sellers are unresponsive, and the town center spams your chat with a welcome message - the village is suffering from the bug.
The server is set to restart every 3 hours, as long as no players are logged on. For the most part this should fix villages. However, if it turns out you are having a lot of trouble with a specific village and it is becoming frustrating, there is another work around. Chunk Loaders. Both RailCraft and Ancient Warfare allows players to make Chunk Loaders, which can help keep the village from experiencing this bug. Place several blocks deep, below the primary building where you sell them resources.