A patch for the population cap bug has been pushed to Steam. The game should update automatically - you can check the version in the lower left of the start scene look for version 1.4.1 or greater. If the game does not update you may need to restart the Steam client.
The current patch only includes this fix as it was game breaking and needed to be fixed ASAP. Other "minor" bugs have been reported and will be fixed in future patches.
Thanks for all the feedback. Errors and bugs will get fixed as quickly as possible.
This includes a fix that could cause the game to crash when a player's last warehouse is destroyed.
This includes a fix that was preventing players from joining multiplayer games.
This includes a fix that was preventing watchtowers from targeting enemy balloons in multiplayer games. Also a fix for building flags showing the wrong color in multiplayer.