I bought Cubase 13 pro and dialog boxes showed with black options. I run my system in windows 11 with a 50 inch tv with powertoys installed (version 0.75.1). I use FancyZones. Disabling the option “move newly created windows to last known zone” fixed the dialog boxes and now I can select the option I want and click on it. Don’t know if that would solve it for other users. Ryzen 5900 and RX6600 latest graphic driver (23.11.1). Cubase 12 pro works fine with that option activated or desactivated, as well as other softwares I use.
Welcome to our community. 
And thank you for your comment. You have already helped at least one person. 
Don’t fully understand where the issue is sourced: is this a Windows 10/11 setting or is it by any other 3rd party software or PowerToys added feature? Haven’t worked that much with CB13 yet, but seeing so many bugs makes me concerned hence I am trying to fix those in advance where possible. Thanks for helping to better understand.
Fancy zones is a 3rd party application, from microsoft, to manage multiple windows in large screens. I use a 50" 4k tv as monitor in the studio.
Sorry to hear about your bug. Have you figured out whether this would help?
Cheers,
Armand
I had the same problem. Even on v13.0.41. The Nvidia settings didn’t change a thing either (using the studio-driver). BUT, the FancyZone-setting made all the difference and now it’s working again 
This is a big fix for many programs! You’ve saved me here!
If you’re seeing black boxes instead of “ok” “cancel” Save" “Don’t Save” in dialog boxes, go to Powertoys Fancyzones settings and turn off "move newly created windows to last known zone”.
You just saved me buying a replacement GPU! I was losing my mind thanks!
It did take me 10 searches to find this so I’m adding some words for seo search optimisation for other users! Many people don’t know that the Dialog box is called that, they just think about the buttons they cant see.
A million thanks again to you!
Dialog box black options, save box black, dont save box black, cancel box black, black box ok, black box cancel.
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Thanks - started having this problem recently with Cubase 14, Windows 11 and an Nvidia 3060 and this has fixed it.