During my first try with the program I had entered a lot of data in step 2 and my browser crashed so I lost everything. Since then I have been saving often but the process is time consuming. Each time you save, the program reverts to the basic step 2 menu. You then need to navigate down through System>Zone>Room to continue entering data into the detailed menus (walls, windows, doors, etc.). Could the save leave you in the menu you are currently working in?