One of my colleagues recently had this strange picture on his screen. What could it be? It's Vectorworks 2022 SP5 (German), a MB Pro 16" 2019 with MacOS 10.15 with all updates. 16GB Ram, 8GB VRam. The "problem" just occured once, a few days ago and it was visible on the MacBook screen and on the connected USB-C screen as well. Unfortunately it disappeared and after rebooting and didn't come back. So, I guess it's either a videocard issue or some software problem (MacOS or Vectorwo