I have a couple of things for you today. First, the Alt keyboard key both enables “Subtract Selection” as well as rotates the camera; therefore, using the alt key to subtract from selection is impossible. Also, exporting to .png crashes the application way too often. I’m not sure what can be done to fix this, but for the app to go public I believe this is something that needs to be solved. For example after exporting to 1080p 3-6 times the app will just crash. Since the latest update, exporting to 4K rarely works and crashes the app almost every time. Hope this helps!
PS: New video in the works. Should be out this weekend!