If it is a finished and exported map, then make sure you are putting all the files into the exports folder. Also, you can get your character out of the map by logging in here to the site and going to the user panel, clicking reset home, and then go home. I am unsure of whether or not you are able to get unfinished maps back into the game with the new addition of meshes an all, but you could always give it a try by making sure you put all the files associated with the in progress map in the folders they belong too. Exported files will not work here, they have to be the raw unexported ones, such as the height map, terrain mask, etc.