Because I'm using the bulldozer tool for longer than 15 minutes at a stretch on my new terrain, it's become obvious that the auto save is not working. The bulldozer tool will close the TE to the desktop with an error if you pull rapidly out to the edge of the screen and your mouse goes just past. I've post subsequent DMP files in another bug post concerning that. I'm building up and cutting canyons across a 1\3 arc of the map 30 miles deep. Takes longer than 15 minutes to finish one pass with the tool pulling 2mile wide ridges, 15 miles long every 3 miles across that arc face. I lost a block of work due to the issue with touching the mouse to the work space boarder.
I can do the work again, and better the second time due to the first pass practice. What I noticed is I cannot change the time of 15 minutes to 5 minutes for the auto save period unless it only works during the current session. If I close out and reopen the TE, it's back to 15 minutes.