I may be posting something that is already known. I updated to 4.0.43. I have Cubase Pro 10.5.12 with 3 monitors. VST Connect SE always opens on monitor #2, and as soon as it opens, it either freezes with a blank white screen, or I occasionally do get the normal screen with video and then it freezes. It crashes all of Cubase, and I have to go to task manager and “end task” (where Cubase usually shows as “not responding.”) If I turn off all my monitors other than monitor 1, it seems to work fine. If I get it working, and then turn on my other monitors, it continues to work fine until I move it to a different monitor. Then the whole thing freezes. It may have something to do with the video, because it does not freeze immediately, but rather after I click the video icon at the bottom.
I saw a number of other posts where others complained of freezing, and the the suggestion is to wait for 4.0.44. I just wanted to post that it may have something to do with multi monitors and/or video.
If it helps, I have a Logitech QuickCam Pro 9000 camera, and an AMD Ryzen 3900x CPU with X570 chipset, graphics cards is a Sapphire RX 5700XT Pulse (AMD Radeon).