Thanks for your reports. Crossbow bug is a rare unit script bug that sometimes effects all units, if you restart the game it`ll fix itself. Only happens rarely - and eventually we`ll get to this.
Max pop in-game is 90 for the homeland and you can`t get passed that. We`ll most likely disable building housing once you reach 90.
With regard to the other bugs you reported - thanks for posting this, we are investigating both the pop dropping, swordsman bug (that might effect all units actually), and the storage space issue. In a day or two I`m hoping to have these fixed.