Every once in awhile when I go to save my forge, it won't let me "save changes" and only lets me "Save as a new map" This usually, I think, happens when I'm starting a new session (i.e. just turned on the xbox and begun for the day, not in the middle of heated forging/saving session). Any thoughts?
When you enter a forge lobby, if you just load up and start a game on the map that was already there, it will do this. To combat said, go through the list, and select the map every time you enter a new lobby, then go back. Or, to be safe, load it up again every time.