Same problem here with me and my bro doing multi-player. My game is still showing Alpha V1.2.6 btw.
Should the save-all command be all that is needed to save a map and quit out and play it later?
Either way, I may need some sort of add-on to help? really not sure what to do. We've worked hard on like 3 uber awesome maps so far, and they've gone to waste... all help appreciated.