Unfortunately, switching from 3D to 2D still doesn't work in LE13. In which file is this controlled? I'm not a programmer, but maybe there's a way to fix it.
It works as soon as it has been quadrupled once, then you can switch from double to quadruple, as if the correct command is functioning too late. Instead of initially halving from 2 to 1, nothing happens at first, then when you switch back from 2D to 3D, the image appears doubled, and then you can switch happily. I hope I am understood.