Hi,
a user reported that when you set up 2D view in the DMX monitor, then switch to DMX view and save project, 2D view settings are lost. When you open the file again, 2D view is empty and you have to recreate it from scratch. I've fixed it in git (4.8.4) but to avoid data loss:
!!! Always save project when 2D view is selected in the Monitor window !!!
It means that DMX view settings will be lost, but they are easier to bring back.