If anyone's using the MAC version of the Demo game - you may want to delete your saves from older demo versions before playing - heres the folder that your saves are being stored in - /Users/[your-User -Name]/Library/Application Support/com.Company.ProductName/*.rma
Some settings (like player location) are kept in the preferences - /~Library/Preferences/com.Company.ProductName.plist - this may also need to be removed to reset the game back to its absolute defaults.