Actually, mine was an incremental update and not the latest 2020 one.
However, I did manage to speak to support who said there were some issues with the latest May update that were causing issues with Cubase. This is firmly changes that have been made to the MS update that have caused this. I work along side a software house in robotics and we’re constantly finding MS updates breaking the software we work with. It’s quite normal in our world.
My advice would be to give them a call rather than raise a support ticket. I used an international call number and the call cost me less than £5 which went a long way to get my issue resolved.
If you cost up £5 to the number of days it takes for Steinberg support to get back to you - it’s a no brainer.
I hope that helps!