Version : Cubase 13 Pro
OS : Windows 11
Steps to repro :
1: Start a new project,
2: Split Project window and Mixer Console windows side by side.
3: CLick Studio->More Options->Studio Panel
4: Once the panel opens click on the title bar of the Studio Panel dlg.
Observed :
The main project window goes blank as shown in attached image.
Note : Once you click anywhere inside the project window it comes back.
I have two projects open. One active and the other in another project window. I believe what might be happening is that the other project window is getting focus and the UI isnt drawing on a non active project window.
Also, note seems like I now do not have to open the Studio Panel. I think the UI on the second project window is just stopped.