Bug (in versions b-c): I created @ 15 or so custom kingdoms/empires & started a game, it played with all factions I had selected to be in the game (@ 20-30 of them).
2nd game I started, my custom factions never showed in the 'join participating kingdoms/empires' screen in game setup.
The problem did not fix itself after upgrading to version c
This problem has happened on two seperate machines with different specs & windows programs