I had the white GUI window issue with my Waves plugins after a Windows 10 update and with Waves tech support managed to get it resolved yesterday. My NVIDEA video card driver was causing problems as it doesn’t play well with Win 10. We uninstalled the card and let Windows detect and install a generic driver for it and that solved the problem. Don’t know if this will help anyone else, but seems like an easy enough thing to try. Best of luck!