First found the mod and thought it looked cool. Upon further inspection found initial analysis to be correct. Had a grand time for a couple of hours, saved it and shut down the computer. Come back and run the launcher, everything appears to have been reset. Profile was gone, world save was gone. I don't know if I've done something very stupid or if this is a known bug (which I certainly should think not, as not being able to save anything would undermine the purpose of a save button). Just thought you ought to know.