I had this problem for about a year now.
The workaround was to unplug my 2nd monitor when loading a project with video.
After going back and forth with Steinberg support, checking every component of my system, we identified the problem. In my case it was the nahimic service exe that caused the problem. So if you got a asus rog strix motherboard, go check for that.
All working perfectly now here!
