I've sent a small update live bringing the client to build 24. This is a backwards-compatible update, so you can update or not, as you wish.
Changes:
* private game joining is fixed
* "gather food" button no longer visible during winter (anyway you would gather nothing)
* game now automatically pre-selects the first idle peasant on actions - less clicking
* market will not allow you purchases if you can't store them (no home)
* a few small bugfixes