Since upgrading to 4.2 I don’t have a mixer window anymore. Using F3 or clicking on the mixer icon on the top of the screen does not open the mixer. I am using Windows 11 and I have the Dorico Icon on the task bar. Hovering over the Dorico Icon shows the Dorico window and a blank white window labelled mixer but it won’t open. Also in Play, I have faders in the mixer section but no sends or inserts. In the Track Inspector it does show the insert slots and channel fader. I don’t know if this is a problem with my system or a bug. I still have 3.5 installed and the mixer is correct.
I have this problem too in multi screen configuration with window 11.
As a workaround, try to move the mouse to the Dorico icon in the task bar, then right-clik on the mixer window and select full screen.
Is there instead of the Maximize the Move item that you can choose? If so try that and then use the up/down/left/right keys to move the window. Maybe the window has slipped off-screen and by moving you can bring it back into the visible area.
The comment window and the Manage instrument window work fine. Disconnecting my second monitor didn’t make a difference either. Internally the mixer is working. I have older sessions which use sends and reverb, I just can’t make any changes. I attached a diagnostic report if it’s any help