When ever you save game and exit, and when you log back in your current level is gone and all the money you've made
Version: Win32 Alpha 0.0.6
I had the same problem but I tried it a few times and it worked.
I'm having the same problem did you manage to fix it?
I'm having the same problem for V1.05_Raft_Win32.zip so if anyone has any idea what causes this message me.