This one I think is due to the general UI freeze that occurs upon the joining of a new citizen. The first one you listed there may thus be related also. A save/load fixes this issue—well, it’s a workaround, I should say—but unfortunately save/load is itself associated with a bad bug presently. The solution for now (until the dev team fixes either or both of these) is to save often, so that if a particular save is broken, you can load a previous save in that world, and you always have something to do when the UI freezes.