I had the problem that the perspective window turned black today several times (Win 10).
Redraw command didn't work, changing to 4 windows and back didn't work. Only restarting C4D helped.
Downloading and installing the newest Nvidia driver brought no improvement.
And am I the only one with the problem that changing the camera via HUD does not work sometimes? If I change from perspective view to 4 views and back it works again, but not for long. But this is no new thing - was in the last few versions too.
Simon