Same issue here. As Serge123 said it seems to be a problem with multiple monitors. I have the mixer on the 2nd monitor, the arrangement on the main monitor. When I open a Waves plugin on the main monitor, everything is fine, but when I open it on the 2nd (mixer) it gets black and Cubase crashes. I have this issue since many Cubase versions. I just try to avoid moving Waves-Plugin windows to my 2nd monitor. If it happens anyway I just restart Cubase with only one monitor…
I just don’t understand why it is so hard to make it work… I talked to Waves, they’ve sent me a list of supported monitors (mine is on the list) and as always Steinberg does not really care… whatever… For me this only happens with Waves plugins. I’m on Win10 64 with Cubase 10.0.30. Just tested… still crashes, haha.