I have absolutely no idea if this is an error on my end or actually a bug in WM.
When I fire up WM and then make some terrain, then save, it overwrites the startup.tmd file found in my WM documents folder. I can confirm that this happens on 4016 and also 4017.
Does this happen to anyone else, or is it just me? I did a clean install of WM just to be sure, but the issue persists.